For most people, the stars and dryer sheet remarks are directly based on the number of posts they've made. Moderators currently have 5 green stars and admins have 5 red stars. Occasionally individuals are singled out for mockingspecial treatment. At the moment I think only brewer12345 has a special "star" count: one large birthday cake for posting the 100,000th post.
The current count breakpoints are as follows: 0, 10, 25, 50, 500, 1000, 5000. After 500 posts the dryer sheet references give way to remarks about posting a lot.
For grins, here are the user counts for each group in order from 0-9 posts up through 5000+ posts: 2347, 268, 160, 296, 43, 39, 5.
There are 8 moderators and 1-3 admins depending on how you count them. (3 admin accounts, 2 actual people, 1 account that currently posts.)
I kind of miss this special graphic: