really just thought Id make a fun raffle, didnt know there was so muck backlash to this, Im sorry.
Read my edited advice - and do you actually have 10 bitcoins in funds? Or are you just going to wait until 20 people send 0.5 BTC each, then do the raffle? I think it's the second option. Not safe, unless you escrow the whole thing. Even then, there are more fair and trusted lottos on bitcointalk, such as Dab's provably fair lotto.