And what price inside those 24 hours you take, the one when withdrawal is made, average, one when you process it?
This should be more clear, Bitcoin is volatile instrument and 24 hours time span can make big difference.
We purchase the Bitcoins at the prevailing market price when the withdrawal is processed and we send them over to you at that time. We do not do any average price. When our Payments Department begins to process the order, that is the exchange rate that you get. Your coins are purchased at the price on BTC-e.