Keep in mind that you are not 'buying' from the Timeshare Store. You are buying from a current
DVC owner who is selling their contract.
The Timeshare Store is simply the broker in this transaction. Basically the middle man.
I suppose one could ask the seller if they would accept a credit card, and basically lose up to 3% of their asking price.
I know if I had a business where I arranged a sale between two people, let's say for $3000, and my commission was $300, I sure wouldn't accept a credit card for the $3000, and pay a $90 fee to the credit card company which in turn would knock my $300 profit down to $210. (OK, I know it probably wouldn't be the full 3% on larger charge amounts, but you get the point)
Likewise, why would TTS ever want to pay a credit card fee to accept funds that are going to the seller of the contract?
GMAC probably accepts a credit card up to $4000 because their fees are that much higher to begin with.
Just .02