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.
The negative trust is because of cryptodevil but ok I understand.
You have another way to pick 3 numbers that will be provably fair?
Escrow is an option, better was if there was a hero member with good status to hold the funds, will pay the price and he relase the funds to me. But who would like to do this to put some time in it and then I have to put price a bit up for a share for him too