sometimes they do, as long as it's profitable for them.

I think it's masternode-based anonimity (DARKcoin SEND, darkcoin is the former name of DASH)

I can't do that.
I thought that Polo was reliable but I will have to change my mind.

Down again, same time in the night as the last time it blocked.

Well, this update is well over my expectations! Congratulations to the devs! :-)

Krnlx said his cuda port is faster.

diff goes down smoothly, no real advantage.

thanks but it doesn't start any kernel on the devices.
no ram usage, nothing.
ubuntu 16.04, cuda 8.
do I need cuda 7.5?

You seem to not realise the obvious: dev fee only works on closed source miners.
The reason is that there is no difference between free donations and donations by fee.
People will not donate in both cases. Just because they can.

It's very weird that miners prefer a closed miner with fee over an opensource one supported by donations.

Pools are down but fear nothing, I'm moving the chain for you guys ;-)

DOWN for many hours.

I'm getting about 70, do you overclock? Which code base?

I can't help you, it's all Poloniex fault.
BTW, maybe someone can put up a block explorer (the code is in github).

I'm not a dev of the coin but I did work on the miner and also did a couple fixes to the wallet.
I've talked to poloniex multiple times, they say they have no intention to drop XCN, they are just having troubles running the wallet and assured me it'll be up as soon as possible.
Meanwhile you can trade on BTC38 or Bter.
Finally, if you have issues syncing the wallet, just read the last pages of this thread to find a chain snapshot to help on coin bootup.
Other than some issue with syncing from scratch, the coin works fine and has still a good amount of trading.

You need to rewrite the miner :-)

What algo?

From a miner's perspective, the future success of a coin doesn't matter.
If you wanna hold, you'd better buy.
Mining is about hashrate and efficiency.
Mine and sell: you make more money and you can buy whatever coins you want with that (even non-pow ones).

Depends on too many factors.
You must find out yourself, and continually adapt to the conditions.
Btw I don't think Claymore does 250W on the 280x. I think much less.

The cost of the power a card will use thru its life will likely be more than its value. For sure much more than its cost minus the resale price.
Hence the power usage matters more than the buying cost.