Eddie the founder of Stake.com which you are promoting is the best example on casino owner that gambling on their own casino. He created promotion which is Stake vs Eddie that players on Stake needs to beat his multiplier in able to win. He is known for doing live stream of his game.

I believe other casino owner play on there own casino discreetly because they will not enter on this business if they are not into gambling by themselves.

https://stake.com/promotions/promotion/stake-versus-eddie