Yes lower profit for the house, if you have the entire bankroll then you keep all the profit (if your a casino with a -EV and not idiots you will eventually be in profit), if you own 50% of the bankroll, then the other 50% minus whatever part of profit your charging your investors is gone.
So yes, it is lower profit for the house and most certainly not even. You would not make as much money having half the sites bankroll compared to the entire thing.