1. I'm not going to play roulette if it's -EV.
2. "wins" means "payouts"? or "profits"? And what's the admin fee?
3. I didn't know if the 90% you PM'ed me was super secret or not, so I picked a number.
4. Maybe the issue is with the max bet. Can I bet 21 BTC on a single hand of blackjack?
1. They probably don't know that.

2. wins means payouts of a bet. To be clear : bets - wins = profit.
So equation becomes: (bets - wins bonuses) admin fee
Admin fee? No idea.
0% as given on
http://www.askgamblers.com/casino-affiliate-programs/bitstars-casino-affiliates-review (i googled it)
3. 90% for highrollers.
4. idk. Can you check? (edited)