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