there's no way to know the answer to that. Most of the time we have more guests on the forum than members. There is no way to tell if one of those guests follows up on a lead they saw, here.
If you look at the number of times a post is viewed that will tell you how many people are interested enough to look at our post
I post things I would have been interested in back when I was looking. If it helps someone out, great. If not, I've wasted 3 seconds of my time posting a link.