I saw a card I really wanted on the auction house yesterday. There were two of them and one was really heavily discounted. I decided that I really wanted that player enough that I bought $5 of perfect points so that I could afford it.
By the time jumped through the hoops (steam and paypal) and had the points in my account (is was probably less than 5 minutes) the cheap card was gone and now there was a second version at a significantly higher price.
I can only assume someone else saw the bargain and tried to make a profit. I can't blame them but I really wanted that card in my lineup!