[hnriot]

this is absolutely not true, stackoverflow is an invaluable resource and what you say might happen very occasionally, but the vast majority of upvoted answers actually helped a lot of people.

Despite what you claim as lacking rewards it seems to have thrived and attracted contributions. I don't really care what you consider a good community, or even accept the premise that there needs to be any notion of community. Why attribute labels, the model seems to work just fine.