A slightly off topic but a suggestion: In many of the tech forums where you discuss related to issues and whatnot, the users who ask questions have an option wherein they can vote whether the post helped them solve their issue or not. I'm thinking if those sort of ideas would help or not.
There are a couple of things that came in mind:-
If a query is answered, the user who asked the question can deem it to be helpful/not helpful.
If the issue is solved, the thread will be automatically locked. And no one can necrobump it later on. If not autolocked, the mods can verify the issue to be solved and thread will be locked by them? This would be a hassle for the mods, autolocking feature does help here? This is just a sort of a basic idea. And who knows, this may help stop shitposting same thing over and over again. Maybe even combine this idea along side the merit system. Who knows.
I don't know how bad of an idea this is but I'm just throwing it out in the wild.
I've revisited this thread, and a thought occured to me with regard to tech questions.
Although the initial query was answered, there may be secondary points that arise, and discussion of these could be of benefit to members.
I agree that repeated postings of the same solution are of no benefit to members.