So investors are paying all expenses out of their 30%?
No, I don't think so. In Dean's first example:
In 3 months players lose 300 Bitcoin playing dice.
[and the site spends 25 BTC on expenses]
275 profit.
So the investors from the ICO would get a dividend share of 82.5 (30% of 275) paid into their BetKing account.
I would be paid 192.5 (70%)
There was 300 profit, 25 expenses, so 275 net profit.
The investors get 82.5 whereas 30% of the gross profit would be 90, so they are paying 7.5 BTC towards the expenses.
Dean gets 192.5 whereas 70% of the gross profit would be 210, so he is paying 17.5 BTC towards the expenses.
In other words the investors pay 30% of the expenses and Dean pays 70% of the expenses.