Of the first 300 alphabetical members on this site, only 5 have more than 499 posts.
I'd say I'm right, LOL.

That would mean 98.3% of members have less than 500, and the rest of the groups is divided up amongst the remaining 1.7% Of course, a truely accurate representation should probably consist of at least 1000 samples. There will be some variance in my sample of 300.