If you're around long enough and keep reading whole threads, you can see what kind of advice some people offer and what kind of posts they write. Yes, you're going to get some regurge. That's what happens when people keep asking the same question and making the same thread topics over and over again.
However, not everything is regurge and those posts with legitimate advice/insight really shine in the more uncommon topics. And I believe that those are the posts that really show how knowledgeable and experienced a person is.
The "overnight experts" are pretty obvious, in my opinion. Especially if you are familiar with their threads and posts.
And I do believe the folks who are known for their dependable and authentic advice are noticed.
Just keep reading and learning. The members who know what they're talking about have no issue standing out in the topics that weigh more than the common thread.