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?
Just because you haven't heard of it doesn't mean that it doesn't exist or that is isn't common place. A quick google search for "poker staking" will show literally millions of results. It is extremely common.
As far as trust goes I have 110 green trust, have had no collateral loans which I repaid, and have completed several freelance projects here in the forums. I can also prove ownership of this account dating back to 2015. In addition to that I have nearly 1200 positive feedbacks on bitify.
editHere is a decent article explaining why a profitable poker player would want to setup a stake like this:
https://cardplayerlifestyle.com/top-10-reasons-you-should-consider-getting-staked-to-play-poker/editI have asked one escrow so far if they would be interested in escrowing this. I wouldn't need the full balance of the stake to play each day. It comes to just over 10% that is actually needed to play on a given day except sunday when in profit and playing the 2x $22 tournaments. With an escrow each day I would request a top-up if needed. Should investors wish to stop they can simply post and tell the escrow. Obviously there would be fees assoicated with the escrow so I'm thinking 55% profit for investors, 5% for escrow and 40% for me with me personally covering escrow fees should there be no profit, the stake not fill, or investors wish to close out early for some reason and it is not in profit.