I am not sure how these guys tweak the machines at this particular place but since we were there, we haven't seen anyone get anything.
Just like that. Similarly to the the slot machines and other things in the casino. The house always win. At least in long term. There are 1-2 lucky people to create the appearance that these machines are legit and good, and not (complete) scams.
Yep exactly but the kids don't understand and never played so need to let them know what it is.