I have never heard anyone willing to invest their money on gambler even if the gambler is a professional or well known gambler. Dont be offended, but I think it wont work as these days it is not easy to trust others in this online world especially if we are dealing with gambling activity.
If it is possible, using an escrow for the investment will help you gain trust, indeed it will not easy to be implemented as you need the money to play. The main problem is, how we can trust you with our money?