Because I'm in the top 1000 FWIW.
I think top 100 is 2 stars and top 10 is 3 stars.
Do you know if this is based on total number of posts, or is it weighted against other stats, like post count vs. merit or something?
Vod is probably a better person to ask but I'm pretty sure each of the categories that have rankings and stars are independent of each other. Trust, Posts, Activity and Merit each show a ranking only for users in the 1000 and posts is the only one I'm listed in.