You could put a minimum requirement of posts, like 75-100 or so, so that people don't create new accounts to play more times
The prizes could go like:
0 -> 0 FNH$
1 -> 5 FNH$ ** The player must stop playing to get this money **
2 -> 20 FNH$ ** The player must stop playing to get this money **
3 -> 50 FNH$ ** The player must stop playing to get this money **
4 -> 100 FNH$ ** The player must stop playing to get this money **
5 -> 250 FNH$ ** The player can go on playing without losing the 250 FNH$ **
-------------------> Earned FNH$ amount recorded
6 -> 500 FNH$ ** The player must stop playing to get this money, else, he will win 250 FNH$ **
7 -> 1000 FNH$ ** The player must stop playing to get this money, else, he'll win 250 FNH$ **
8 -> 2500 FNH$ ** The player must stop playing to get this money, esle, he'll win 250 FNH$ **
9 -> 5000 FNH$ ** The player must stop playing to get this money, else, he'll win 250 FNH$ **
10 -> 10000 FNH$ ** This would be the greatest ammount of FNH$ you can win **
Or some kind of similar game
And about the questions... you could ask some people to work as question makers, but they would not be able to play the game under any circumstances
