I'm looking for a automated promotion system. Something that can look at the number of posts a user has made with a certain tag, and then upgrade their role to one with more abilities.
Specifically, I am in the midst of implementing a ClassiPress site (http://wpclassipress.com/). I'd like to make it so a user must post 10 ads in a certain category, before they can post in all other categories. Is there anything like that out there?