We are using the same rate for buy and sell several exchanges are using that . i don't think there a problem in that.
if we are taking bit coin at 5% above market we are also giving 5% above market.
You are trading it a 5%
below market, not above. It can be sold on Bitstamp for 0.0045
BTC at the moment which would be almost 7% instant profit, it's a real cash cow you have there if you can make 5%+ on every trade
