Interesting point, but I´m pretty sure the store will want to refund it to the same card as the item was purchased with. And it probably is illegal.
The citibank method you mentioned will work, but only three times. After you´ve made three balance transfers to a citi card, you get no bouns points. :cry:
Youŕe thinking along the right lines though.
Sam.
PS: Is it 2:1 or 1.5:1 on your CPA AMEX?