I did lower the ticket price. Cheap and fun to play.
Ticket price 0.001 BTC. Once 20 tickets are sold we do a draw.
3 prices,
1st 0.01 BTC
2nd 0.005 BTC
3th 0.003 BTC
90% of the incoming money will be paid back.
I think that the ticket price is not the most important thing here, there is another important thing that is Provably Fair. As other mentioned, using random.org is not provably fair. You have to use other ways to draw the winner which is more provably fair.
Other thing you need to do is using an escrow to hold the funds. Otherwise, no one will trust a member with negative trust.