So when i purchase items on the fly as fast as I can when doing buying low and selling high to make a quick profit the actual price that i agree to "Buyout" at is not the actual price paid.

I've made two purchases of radiant ruby's where the price was 5000 gold and yet when the transaction showed up in "completed" it showed up as 6999 Gold.

Is this the way the auction house is intended to work?