You can't apply for more than 3 cards during a 60 day period, and if you follow the instructions I posted on page 3 of the thread on the link below, you could easily do 12+ cards a year. You could keep the card, but I would not recommend thi card in your wallet. Use the SPG AMEX for your regular CC.
http://www.flyertalk.com/forum/showt...=778645&page=4
Jim