I received a little over 1.7% of my held balance back.
If the exchange rate goes up much more that would make it harder on BitFloor. It is like taking out a BTC loan and then having to repay from dollar-based income.
No, because the transaction fees are a percentage so it scales up. The only way to make it harder or easier for Bitfloor to pay back its debts is to change its volume.
Right, and for all of us doing dollar cost averaging increase in price means decrease in volume.
OTOH, if Bitcoin goes to $1,000, you can bet on there being a lot higher volume, just because an increase in price generally correlates with an increase in interest.