Many players still don't understand the action points in OFC. They play with a short stack, and if they hit fantasyland, they have very little action left. They win much less than they think they are supposed to, and think it's a software glitch. As a result, these players may stop playing, and that's bad for the games.
Perhaps there could be a pop-up briefly explaining that you can't win more than your starting stack on any given hand, and that fantasyland counts as part of the same hand that qualified for it. This can show when someone joins a Chinese table, and of course a check box to stop showing the message to those who have seen it.
I thought you had to have x amount to join (like, say, at least the maximum you can lose), a lot like hold'em (where you can't just join with half a big blind).
Example: Someone was sitting with 43 points worth of chips. He made Fantasy Land and won 38 points total from his two opponents. Since the best you can do is double up on any given hand, and FL counts as part of the same hand as the one that qualified you for it, he only has 5 points left to win. We play the FL round and he wins his 5 points. Then he says "there must be a glitch, I should have won 30+ points there", and leaves.