Sometimes a person with a high post count can be the one to talk to, sometimes not. It depends what specific forum they dwell in. If they live and breathe Reef Discussion, then one might imagine their posts carry more validity than someone that dwells in The Lounge.
I spent many years on Reef Central helping others. I amassed a lot of posts, and in that time there were plenty that said "I don't know the answer to your question, but I'll try to help anyway..." with questions or alternate thinking. Sometimes it worked out, sometimes others had to chime in to assist and find that solution.
However, how the words are posted is just as important as the content. How we interact will affect the outcome, and never forget the lurkers that just read quietly. They too are learning.