Naw, I don't think so. I think the trading thing makes them more fun. Actually, being able to trade makes me want to find them. The exploration cards? Didn't give a hoot about them until the trading forum went up. Figured it would take too long to get a prize, if it would happen at all. But now? I might be able to get some nice goodies for them, so they might be worth searching for once in a while.
If there's an excess in the number of people cashing them in, he can always lower the odds a bit. Besides, for 100 cards, you only get moves, and well you spend a lot of moves to get them in the first place.
The other cards (ten star card set)? Well, the MAXIMUM number of people who can cash them in would be the rarest card of the set. IE, if say only 4 people in the whole game every month get a red card, then that's the max people that can cash in a set, no matter how much trading goes on. Of course, I don't know how many red cards are found each month, but I'd think he'd have the odds worked out so he could afford it.
But yeah, with all the new prizes at first I was been a bit worried how he's going to be able to pay for all the new bonuses if people are winning goodies all the time. But now I'm like, eh, he knows what he's doing.
