The fact is high-qualitied threads / topics are always high-qualitied ones based on their high intrinsic values.
But, they might be helpful for someone and un-helpful for others. I agree with you at this point.
Threads/ topics will be only helpful if they published in-context. A high qualitied ones might be un-helpful ones if posted in the wrong places, out of current discussions.
Every person is different for giving state. Maybe good quality for you, but not good for the other.
No need to make friends. The simplier way is follow prestigious members in the forum. Adding them into your Following List, keep watching their threads, topics, then learn from them.
It's enough to start learning from high-qualitied forum members.
Some of them are:
1) TMAN.
2) Jet Cash.
3) Lauda.
4) iasenko.
5) mdayonliner.
6) zentdex.
7) Forum staffs (of course)
And more (you should find them by yourself).
Make some friend who have a lot of merit. Ask him suggestion and do what he said. If you want make a Post, ask suggestion.