No. The numbers are not being manipulated anywhere. Just because you have failed to understand the game logic, you are terming it as a SCAM.

The 10% commission is taken from the Total Returned and it can easily be verified by any player who has an account the site. When logged in, if you click on the bet ID, it'll show you the bet details. That clearly mentions that the To be Returned amount is not what gets added to the user's account. 10% gets deducted from it and and then it gets added. When we refer someone, 5% goes to OP and 5% come to us. Nothing is taken if user loses a bet and all remains in the bankroll.

Moreover, as I can see, you have alleged that OP has increased minimum amount of bet. Increase of mimimum amount of bet does not skyrocket the bankroll, because as in one hand it'll increase the Total Invested, on the other hand it'll increae the Total Returned too. So, the bankroll will remain as is as that is always the difference between Total Invested & Total Returned.

You are just picking up non-issues to wrongly justify your feedback. I wonder why you are silent about obvious scams and trying to malign an honest site. Below are a few example of obvious scams...

CryptoPyramid: https://bitcointalk.org/index.php?action=profile;u=480605
CryptoMMMCom: https://bitcointalk.org/index.php?action=profile;u=511134