Since yesterday, I was discussing in #bitcoin and #bitcoin-dev about a new lotto concept where:
money_given_to_winners = (money_raised_with_bets - 3%) / winners
I already saw similar concepts where there was an extra money coming from mixed sources (such as website monetization), but never anything like that.
If anyone is interested on a trial, send 2.50 to 17WesZnaQgpqvaGWg1X8wwaYKiYnaydxqY (extra amounts will be returned) and PM me your address and 5 numbers from 1 to 100. On this trial, if noone wins I'll return the money.