Under the old system if the site had an unlucky week where the players made a profit overall, the investors would take the loss and not have to pay any commission to the house.
Under the new system the investors have to pay commission to the house whether they win or lose.
The new system is much fairer because the site owner is guaranteed to get coins from the investors whether they win or lose.
You're smart enough to know how misleading that is. Expected return is the same; the investors are just giving PRC free insurance to dampen the volatility in the site's commissions.
If Dean needs consistent income to operate the site, then so be it. People can divest if they don't want to take on the (slight) extra risk.