The tx are low priority.  To avoid the min mandatory fee (anti-spam fee) not to be confused with optional fees paid to increase  chance of faster processing.  A transaction must meet ALL THREE criteria

a) be high priority (priority over 57,600,000 ~= 1 bitcoin day)*
b) all outputs >= 0.01 BTC
c) total size < 10 KB

The first tx has a single input of ~4 BTC which was at the time of the tx 4 blocks "old".  Priority is (4.0E8 * 4) / 250 = 6,400,000 which is less than the threshold for high priority (57,600,000).



* Priority of each transaction is the coin age (in blocks) multiplied by the input value (in satoshi) and each input in a 2+ input tx is calculated independently.  57,600,000 works out to roughly "1 Bitcoin Day" for the average sized transaction (250 bytes).  If you receive 1 BTC and wait 1 day (144 blocks) before spending it will be high priority.  If you receive 20 BTC and wait 1/20th of a day (~7 blocks) before spending it will be high priority.  If you receive 0.1 BTC and wait 100 days before spending it will be high priority.

The exact forumla is:
priority = sum(input_value_in_base_units * input_age)/size_in_bytes

https://en.bitcoin.it/wiki/Transaction_fee

That isn't true.  In case of fraudulent use the merchant not only loses 100% they also get to pay a charge back fee of up to $35.00 for the privilege of having accepted a card that was stolen (or owner simply claimed was stolen).  Worse CC companies make it simply impossible for merchants to avoid/prevent fraud (both third party friend and so called "friendly fraud").  Seller can do absolutely nothing to prevent (reduce the chance but never prevent all cases) fraud and then loses everything PLUS a penalty when it happens.

Who is this entity known as "the government" and how do they have control over all ~180 countries on the planet?

Asked and answered.  See mBTC.

No not really.  The combined tx may be slightly more efficient in terms of space if the private keys were of exact size however if you need to include a change address for each tx the combined tx is going to be just as large as the sum of the individual transactions.   It might be slightly smaller but not significant enough to warrant the increased complexity.  Also the private keys are vulnerable to double spend until the combined tx is created and confirmed in a block.

Yes.  It is no different than anything else.  The exchange rate between EUR:CAD varies throughout the year.  How could Canadian Revenue Office determine how much a sale in EUR is worth?  Oh yeah look at the exchange rate at the time of the sale.

More likely the seller will report in the contract the exchange rate at the time of the sale.  The tax office will simply verify that it is a plausible number.

Hardly.  In a real property transaction the change in ownership needs to be recorded with the state.  Taxes will be paid by all parties.  Bitcoin isn't some magical tax free currency.  Anything of sizeable value causes ripples in the real world.  Say NewEgg accepted Bitcoins and this year did $50M in sales.   Where did the $50M in inventory come from?  think it is going to leave a paper trail.  NewEgg would wisely pay corporate income tax on all that revenue.  If they didn't come audit time it is going to be trivially easy to bust them.

Sure you might be able to sell a thousand dollars in gold coins and avoid taxes if you use Bitcoin but  .... you could do the same thing with cash.  Anything involving real world inventory or property is going to leave paper trail and tax agencies aren't just going to "miss" billions of dollars in commerce just because it didn't involve legal tender.

It isn't the admin (or mods) job to ensure the OP gets his trade.  It is the OP job and for the record it is highly likely the OP will get nothing.  False ebay listing by a brand new seller for a huge sum of money ... not to hard to see where this is going.

(scrambles to place buy order)

Much like dirt coins devalue gold coins.

reversible transactions, no 51% = centralized control.

not a crypto-currency.

MtGox doesn't have 90% of the market.  MtGox doesn't have even 90% of the exchange volume more like 60% to 70%.  If you add in all OTC, and direct brokers it is probably less than half.

Still you already convinced your self Mtgox = ~100% of market and MtGox = Bitcoin so my guess is you have you mind made up.

BTW your depth numbers are just imaginary.

I will leave this here ...

http://en.wikipedia.org/wiki/Unit_testing

(with Bitcoin test driven application development is your friend)

FinCen keeping lawyers employed since 1972.

The annoying thing isn't the compliance it is the impossibility of compliance.  FinCEN doens't even know what the answer is.  Anyone who has actually read the regs on money transmitter can probably spot a whole host of areas where they simply don't apply to a "virtual currency exchanger". FinCEN can't by fiat give itself oversight authority over a new class of MSB (which is what virtual currency exchanger should be) so it is trying to force a round peg into a square hole.

Fun game to play.  Call FinCEN hotline with a list of six questions about the (in)applicability of money transmitter regs on virtual currency exchanger.  Record the answer.  Call again and get six new answers. 

If FinCEN doesn't know what companies should do how can companies know.  How can a lawyer provide counsel when the regulator doesn't even know how they intend to regulate.

It all comes down to risk vs reward vs effort.

With $10 the fees are going to kill you.  Most exchanges have fees on cashing out and bank wire is pretty cheap on large sums ($5K+) but prohibitive on small sums.  Then you have to consider the lag on moving fiat.

Most fiat transfer methods are slow.  So you have $10 net worth.  You buy BTC on one exchange, sell them on another and make say 5%.  Sweet you have $10.50.  However cashing out of MtGox, moving the fiat to your bank account and then from your bank account to BTC-e through a bunch of middle men may take a week.

Awesome you just landed a job which pays $0.50 per week!  Now with $10,000 you might make $500 per week however most arbitrage opportunities aren't that deep so you may make less.  Even if they are if an exchange closes up well there goes 20 weeks worth of income. Sometimes MtGox withdraws get lagged weeks (or even months) so if you only have $10,000 capital and it is all lagged well your income goes to $0.00.  Still with enough cash (willing to risk it all disapears one day when the operators pull a Bitcoinica) you can make the spread bug it is going to take a LOT of capital to keep the exchanges and pipelines "loaded".

I write them and EFF every six months.  I have supported both projects for a long time with annual donations and I will again (including "back donations") but not until they support Bitcoin.

We have no plans to become a eWallet in the near future.  I don't like the idea of needing to secure a large hot wallet of client coins.  Many clients have told us one reason they use us is specifically the 100% cold wallet policy.  We will focus on where we provide the most value and that is being the best direct broker of bitcoins.

The next major version of the site will separate the actions of exchanging and cashing out.  In your example above you could make multiple deposits.   Each deposit will be exchanged at the market rate at the time of the deposit.  When ready you can make a cash out request in the amount you wish.   By breaking the exchange and cash out functions into separate actions it will give clients a lot more flexibility.     

It is a pretty major overhaul of the site so we are still looking at late April launch but I am really excited about the options it will bring to our clients.

So 5,000,0000 tx at a cost of 1 BTC.  Average tx size is 400 bytes so thats ~2GB added to the blockchain for 1 BTC.  At a cost of 1,000 BTC a malicous user could permanently bloat the blockchain by 1TB.  Imagine having to bootstrap as a new node with a 1TB blockchain full of spam which needs to be carried by every node forever for a token cost of only 1,000 BTC.

No all my orders are at $99 or $101.

No and all the comments about resyncing, copying wallet files and other nonsense are off the mark.  An address is valid or it isn't. It has nothing to do with the blockchain.  You could compute and address by hand using pen and paper and it is valid or it isn't.