This is just a guess, but I heard the reason MS uses points rather than real-world currency on XBLA is for tax reasons. I don't know what the difference works out at in dollar amounts, but it could be that the extra is a tax addition if the % range looks about right. Either way it sucks for you PS3 players to have to pay more for the same thing; moreso if it was a conscious decision on the service provider's behalf, though.
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