Stakeholders receive 80% of BetterBets.io revenue plus coins, this would not cheapen things for them because in the end they will ROI no matter if the coin is 0.002 Satoshi or 100 Satoshi.
Yes,seeing myself as an ICO buyer i would be afraid to invest because the stake holders have more than 2 million Rubies and they also get the casino's benefits which gets their ROI much faster.
However, i don't know if there is any guarantee to them if they couldn't get their complete investment even after 18 months or if they made the ROI in much sooner time but in both the cases they might dump their Rubies as soon as they are benefiting from it.