I agree fully. I once was very active at Experts Exchange before that place became too commercial. (What´s the purpose of a forum where you can search, but not view the threads found?).

Anyway they have an "accept one or more answers" mechanism, that helps to finalize threads. You can still post to such threads, though. That gives the author of the answer and the people reading a thread a very good feedback, and mostly there is a "thank you" too.