I think popfan is correct in thinking they are seeing a red flag when suddenly a gamer has half a million or a million credits and there is no record of purchases. they did that to me while I was trying (and succeeded) to get credits on Bingo Bash, just to see if I could. When it worked, I was stoked until about 20 seconds later a pop-up interrupted the game and said something like,"oops! we have a problem here" and it wiped my credits back to what they originally were. So, maybe the fact that I gave myself like 55,000 credits was too much. Maybe I'll try it again with only 2 or 3 thousand.