I'm in agreement with Prelude here.  There's no reason to artificially create any floor or ceiling for that matter.  The market will balance itself appropriately.  Of course, you could provide some kind of warning to anyone submitting an order if they are some X% away from expected earnings, but to forcefully limit what can be done is not the way to go.

By the way, you asked about benefits that justify the premium on MRR.  As a rig owner, I have the ability to remotely manage my gear on MRR.  I can setup profiles to quickly move my hash from coin to coin and pool to pool.  As a renter on MRR, I can evaluate the available gear and decide whether or not I wish to rent it based on scores, average hash rate, location, etc.

I'm not stating that NH/WH is a bad model at all.  In fact, I think the concept of orders is pretty easy to understand and use as both a seller and a renter.  My intention is simply to highlight some of the advantages I see in MRR and why the service they provide is typically at a premium compared to yours.

Congrats again!  I had just checked the pool for our club's best share and saw it was lower and thought maybe we had hit... Checked the block chain and didn't see that magic 25 so came here to find out who the lucky winner was.

As DannyHamilton stated, it happens all the time.  Usually it's poorly written pool code trying to compensate for itself.  AntPool is notorious for creating empty blocks.

Huh... that's odd... I thought uninstall would have removed those two... anyway... yes, you can wipe them out.

As for where to put it, that's completely up to you.  You can certainly install it systemwide as you did with 0.9.3.  Me, I've got a user called "miner" and install the coin daemon under his home directory /home/miner/bitcoin-0.10.1

People ask about this because plugging in a bunch of miners uses quite a bit of electricity.  A lot of people claim they have free electricity because it's included in the rent.  Just because you as the tenant aren't paying for it, the landlord set up the price of rent to include the electric based upon a fair and expected usage.  He probably looked at the historical usage of the property and based his decision on that.

When you introduce mining equipment into the picture, you can no longer be considered using a "fair and expected" amount of electricity.  You could likely get away with a couple U3s or maybe even a single S3/S5... but you're talking about adding many kW of additional power draw to the system.  In addition to your own, you're also scavenging your neighbor's power, making him an unknowing participant in your ventures.

Whatever the case, somebody at some point is absolutely going to notice the fact that their power bill has gone up significantly - by 4kW for you and 2kW for your neighbor.  Assuming you get decent pricing on your electricity of $0.10 all in, that's $438 a month.

Is there a reason why you installed it system-wide?  Just curious... do you have multiple users that might be needing access to it?  Personally, I just compile and build it in a non-root user home directory and access it from there... but I'm the only one who needs to access it .

If you built 0.9.3 from source:

Now, building 0.10.1 from source:

You get everything.  Output from my full node running on Ubuntu 14.04:

I've found the S3 to be flaky as hell.  Some will overclock with ease to 504GH/s.  Others won't even reach the 441GH/s rated speed and will not stabilize at anything above 400GH/s.

My S1s were tanks.  Those would easily overclock to 200GH/s and stay stable forever.

Of course, once I found the S3 happy place, they all run well within tolerances with pretty low HW errors and just about exactly expected hash for the clock.

I updated from 0.9.3 to 0.10.0 and then to 0.10.1 with no problems whatsoever.  I didn't have to re-download the blockchain, or anything like that at all.  I simply replaced my existing app with the newer version and everything kept right on trucking.

Are you asking about this in general, or in regards to a specific pool?

In general, the number of blocks found is directly related to your hashing power.  For example, if you look at AntPool and f2pool, you'll see they are finding the lion's share of the blocks because they are the biggest pools.  Sure, a pool can have a lucky streak and find more blocks than it should based on its hash rate.  Just like a pool can have a bad luck streak and find fewer blocks than it should.

S3 came out of the box rated at 441GH/s (clocked at 218.75) for 340W at the wall
S3+ came rated at 453GH/s (clocked at 225) for 355W at the wall

The Force was not strong with you on Star Wars Day, obviously!

Try running a disk checker to verify your drive is good (to Soros Shorts' point).

I'm not sure where you're located, but the question you need to be asking is "can the outlet into which I plug in the surge protector support the kind of power draw I'm asking of it with multiple 1300W PSUs?"

If you're in the US and are using a typical wall plug, the answer is a pretty definitive no.

Are you using TextEdit to create/edit the file?  If yes, that's your problem.  TextEdit only has a certain number of formats in which it can save a file... rtf being one of those formats.

You can either a) use a different editor or b) rename the file once you've created it.

I'm not a fan of using cheap PSUs and I know nothing of the Apevia brand.  Reading the specs, it's not even bronze rated efficiency, so you'll burn a bit more power at the wall to get the output you need.  However, since your power is free, that really shouldn't be a concern.  Each of the +12V rails has enough juice to drive the S3 - assuming you've got the PCI-e connectors on both rails.  I can't tell that from the spec description.  If the PCI-e are on a single rail, this PSU won't cut it as the max you'll get from one +12V rail is 312W.

As for over-clocking, the S3s are flaky.  Some will push to 504GH/s without even blinking an eye.  Others won't even make the rated 441GH/s.  As I wrote earlier, I've had 9 S3s, 8 of which are still hashing.  Two of them couldn't be clocked any higher than 400GH/s without getting "x" or "-" on some of the ASICs.  One of them has been hashing at 504GH/s without fail.  Another couple hash at 478GH/s.  The remainder hash at 441GH/s.  I've tried every different frequency setting to get the miners stable where they are.  I've tried having all 4 PCI-e connectors plugged in and also only 2.  Never noticed any difference in the performance of the miner.

Yeah, it was a very nice surprise!  Thanks for the boost

You might want to take a look at some of the server PSUs with breakout boards... Some for sale here: https://bitcointalk.org/index.php?topic=1037372.0

However, if you are going to go the ATX PSU route, I highly recommend the EVGA 1300 G2 PSU.  Each will easily drive 3 S3s (I've got 3 of them driving 8 S3s... was 9, but one died and went to BTC heaven).

Here's a guy selling some: https://bitcointalk.org/index.php?topic=1048834.0

I agree, but just wanted to point out that if he's got a boatload of transactions hitting his wallet, each time wallet notify fires off it spawns its own process.  As you stated, pretty much an academic point if all he's got coming in are mining proceeds.

Looks like we've gotten a little bit better...

"bestshare": 1,397,985,393.4723492

Still got some work to do

No, you're not going too far at all .  I still shiver at the "free electricity" part... somebody's got to pay the bill for it, and if you're suddenly increasing the demand by 100kW it'll be noticed.  Unless of course by "free" you simply meant, "power costs are pretty much negligible at $0.01 or less per kWh."

While the S3s are good little miners, I wouldn't be considering them for the space you've got.  I think you'll be far better served by the rack mountable units (S2, S4, S4+, SP10, SP30, SP31, SP35).  I'm assuming here that since you've got the 120U of space, you've already got the cabinets, switches, PDUs, cooling, etc and would just need the mining hardware.  That puts you in a great position (and to be honest makes me a bit envious ).

Your other consideration would be where you'd point all the gear.  Pools like nicehash, westhash, f2pool, etc are all PPS with 3-4% fees.  The upside of mining on this type of pool is you know what you're getting for returns.  For example, nicehash charges 3%, so plug your hash rate into any online calculator (like this one) and take 97% of what it tells you you'll make.  Other pools, like kano.is, BTCGuild, p2pool, AntPool use PPLNS to pay you.  They have a ramp up/down period but things even out.  These pools are susceptible to luck swings.  Find a few quick blocks, make a few extra BTC.  Take a long time to find a block?  Make a few less BTC.  For example, AntPool's all time luck is 101%.

Another option is to rent out your gear.  Services like Mining Rig Rentals (that's a referral link, by the way... you don't have to use it), Nice Hash, etc allow you to offer your mining equipment out to others.  As you can tell from the fact that I put in a referral link, I use MRR.  I also use NH/WH but don't have referrals setup with them.  The idea with these services is that you point your miners to them, and setup a price you'd be willing to rent your gear.  This way your gear hashes at a pool for you until somebody rents it, then you get paid for the rental.