But maybe 500 of them post.
The WxForum regulars are fairly well represented in the top 100, with a few more in the next 100.
Our top poster has 6440 posts, which is notable for his connection speed.
The 100th top poster has 445 posts, or 7% of the top, but hasn't been on since December 15, 2009.
The 500th from the top, only 43, 10% of the 100th, and 0.67% of the top 1, and hasn't been on since May 12, 2015.
Check it out for yourself. Click on the Members link at the top, and then click on the Posts column to sort by # of posts.
The green Status box shows who is on-line. You can click on Status and sort by that...
(FWIW, I doubt my Status box is ever NOT green. I usually keep the forum open on my weather computer, phone and tablet...)