That's a really hefty fee. My rent is more than your portion and the cc fee is 35.00. Would you get the 6,000 points for the 174, or just the 1234? If the latter, then its a terrible deal. If the former, then its only slightly less than you get them by purchasing them directly from spg.
I don't think its worth it.
Also, I'm not sure this inquiry belongs in the SPG forum, but rather the credit card discussion area....