Could we introduce a real monetary cost to posting a bug? That'd disincentivize making massive amounts of noise, but allows people to compete for rewards with worthwhile answers.
I would rather some sort of authenticated peer-rating system. If someone has a history of making good, useful bug reports- then convey that in some way to project maintainers reading bug reports.
I'm afraid any peer-rating system would be suspectible to same kind of point-manipulation other platforms are prone to, slightly increasing the latency but not the amount of spam. Returnable tokens worth real money would make this category of attacks completely infeasible
GitHub is in a good position to do this at scale.