With all these millions of visitors and tons of registered users, you know there's going to be tons of folks who register an alias, are active a while, and later leave for good.

Is there a way of monitoring whether a particular registered user has been active (making comments, uploading, download, or posting in the message board) in the site in the past three months? My thought is that if a non-paying and non-contrubuting person has not been active in the past three months and does not have any skins uploaded, then their alias should be released back into the general pool.