First, there's no body with a high valued account that will risk giving their account to a stranger, if you can accept the offer that one of the user here has given to you, I think that will be fair enough. You can use an escrow service if fear the security of your money, because it's better you send the money to the person let them stake on your preferred game, instead of requesting for the person's account which put their information and account at risk, let them do the bet for you.
I believe this is rather an offert rather about OP openly asking for money so OP can use it to bet and give a fixed percentage of money back to whoever dares to give money to him.
Honestly, it is very likely this is just a scam or attempt to take money off people and then run away with all of it, there is no way someone with a guaranteed percentage of returns up to 35 percent would need liquidity from strangers.
This is one of the oldest tricks on books written by scammers.

If something is too good to be true, it is likely not true.