I don't know how this could be 100% the same as the old model (in the long run) as the old model didn't give dean any profits on losses, and only on wins? or maybe i have my math wrong on that and it doesnt matter..
Sometimes players will lose more than 1% of the amount they wager.
Under the old system investors would pay 10% of the profit, but under the new system they only pay 10% of the expected profit, which is less than they would have paid under the old system if the site does better than expected.