I think it would be cool if u won money from the survial games when you win. Like 50 added into the winnings everytime some1 joins
How about 3 of the arenas you have to pay 100$ to enter. Tax will be deducted and the rest goes into the pot, like the lotto.
I don't think that you should win money but I think it would be nice if you won pvp gear and other stuff that can't be sold to the server.