I am the one to use other's money and get 40%
No way there is no guarantee that you can be trusted and you will not run away unless you can do an escrow where you deposit money to an escrow and only released it when you send the other people's winnings, I figure this is another form of scam, how can you be so sure that you going to win the bet when it's a game of luck.
Escrow is important if there is a trust issues and also to avoid scam, because now a days there is a lot of scammer so, we need to takecare always to avoid scam.