would not make sense to bet themselves, every bet is calculated as a dividend, so they lose 70% of the bet everytime if they do. Also you can check on the blockchain thats not the team.
You forget that 70% of the house belongs to thee players is the only platform giving out of the house to its players. Stake and all the other casino keeps all the profit for themselves.
That's what i though the case could be also. But as long as we are getting dividends i can´t complain about who is bringing the volume.