Yes, there are games that genuinely benefit the player. I'd like to see more of them, too. They take a lot of work, and it's hard to make them have very wide appeal, so the benefit to society is genuine, but small.

The idea I'd like to see gain traction is for someone, or several someones, to write a game that may only get a small audience, but to get a truly hardcore audience, and to have the results of the game-play to be the benefit.

To quote Jeremy Clarkson from Top Gear: How hard can it be?