Not only they need a "surprise effect" at release, but once you played it enough you get bored and move to something else. Harder to keep contributors engaged.

Not only they need a "surprise effect" at release, but once you played it enough you get bored and move to something else. Harder to keep contributors engaged. Unlike tools (i.e. text editors) that you can keep using for 20 years+ and never want to stop using it.