For the life of me, though, I can't guess which one would be more popular. There are definitely a lot of kids playing the game, and they'd use game cards for sure. But then again, most of the folks I play with are a little older and financially more stable, and more likely to use credit cards (or PayPal for that matter)
So which is it? Game cards or credit cards? And feel free to tell us in the comments why you do what you do-- maybe there's some huge benefit to using only game cards that I haven't noticed yet.