It is a reality substitute. It will mess up with your dopamine reward system, see all the theory behind game "achievement" systems.
I would not seriously call a game "out of reality" though, it is a real experience to the user, but dangerously brings rewards for actions that in the "real world" would take larger amounts of time.
The main problem with messing with your dopamine reward circuitry, is that you end up craving for the anticipation rather than the results.
I've read a lot about how to deal with people who probably have gaming addiction. You can't tell them it's not real, especially the people hooked on a single game whichbis often the case for severe addicts. It simply isn't the only reality.
The reward system is designed to get people hooked. If you know what to look for certain types of games are a lot worse than others. The games without it appear pointless at first glance.
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