They used to have a $10,000 credit card limit. At one time CConnect was not charging anything extra for credit card payments, so if somebody paid by credit card, the seller ended up getting slightly less money. I guess some sellers of books in the $2,501–$10,000 range complained. Those sellers lost some bidders (including me, in some cases) because of that change, but they must think that they come out ahead overall. CConnect has told me that larger credit card payments might be allowed for an additional 3% fee, but I recommend checking with them before bidding.