I'm a little skeptical about "high rollers" playing on any machine at all, but the machines are, in fact highly regulated and highly controlled. I'm always amused to see ads about the "loosest slots in town." It's not really false advertising, because the slots are regulated and everybody sets them at exactly the legal limit.
But then there is what is allowed to happen when you don't win. If the machine has already calculated that you will not win on a particular "pull" it can manipulate the loss in advantage ways. For instance, it can land on 7-7-spinning..., spinning, one cherry away from 7. You just missed by 1! So close!
The world thinks they have uncovered a big new secret when they realize that social media sites study human physiology to optimize dopamine release in their victims^H^H subscribers^H^H account holders. Casinos have been at it for lifetimes.
I don't know why you would think there is a risk to the business if a casino lets a guest win an extra game or two.