I was thinking the same thing. I paid $15 on Target clearance, but I have so much other stuff to play, I know I won't get back to it. May as well cash in and get more than I paid.
In fact I added up the total of what I paid for the 6 games I want to trade in vs what I paid for them initially, and with the extra 40% I'll profit a whopping $2.
CASH ---> +$2 CREDIT <> Profit