I think everyone pretty much has some sort of internal filter to choose who they see as reliable and not without needing a popularity system instated, which doesn't actually prove anything.
A more useful indicator could be to have users add somewhere the approach that they use, so that users who are less knowledgeable with the members here and have a preference for one school of thought over another can differentiate who to take more seriously.
Although I think eventually most people catch onto this naturally