Apple's forum (and many like it) has a little post count indicator. There's also a "level" beneath your name and, while I don't know how Apple's forum decides this (if it's purely based on post count, activity over time, how many people hit the "me too" button on your posts, or something else), those can be powerful incentives.

It seems silly, but there's probably a term for this because these little labels can easily influence our behavior. For me, it's the completion percentage in Lego games. The only Lego game I've ever played that I haven't 100%'d is Pirates of the Caribbean, and that's just because the game was so crash-happy that I literally could not complete story mode no matter what settings I tried or what steps I took in-game to try and avoid whatever I suspected might be causing the crashes. I even toiled through Skywalker Saga, despite what an absolute drag that game was, just for that 100%.