Anything else gambling skill games?

[UprightCreature]

Fine, forget about comps and cashback making -EV machines positive, even though a skilled player (the skill is both in knowing VP strategy and understanding the comp system and how to work it in your favor).

There are a number of straight up positive machines in Vegas. The El Cortez for example has some 100.9% deuces wild and 100.6% jokers wild machine as well as a number of other machines that return greater than 100% with optimal play. All of these machines are $0.25 machines, its only minimum wage with very fast play. There are a lot of these machines at various casinos around Vegas, though not at the major strip properties.

The reason why both the comp scam and positive VP machines exist is because the typical player plays nowhere close to optimal VP strategy and doesn't actually get the maximum theoretical return in the long run.