Two suggestions.. The first one might not be as profitable for the site however could be very fun!
Idea#1: Most negative qualified wagered in a day! Must be level 1 minimum to participate.
Idea#2: A super awesome contest where a player pays a buy in.
Example: Players buy in for .001 btc a piece.. 01 btc ... Even .1 btc.. It could be any given value. For buying in players get 1 TOURNAMENT TOKEN.. The tournament token [TTK] is then divisible the same way btc is with the minimum bet being 0.00000010 TTK.
At the end of the contest, lets say the end of each week perhaps.. the top players with the most tournament tokens will then receive part of the prize pool.
Tell me what you think guy's and gals, admins and mods alike!