We’re purging user accounts with no comments on November 6 — the full details, and a contest, are here: Accounts with Zero Comments will be Purged on November 6, 2012 (Plus, a Contest!).
The short version is that because the only thing here that requires an account is commenting on articles (everything on the site is free; nothing is locked away or user-only), accounts with zero comments tend to be spam accounts. But not all of them! Which is why we announced the purge, spread the word, and are posting this reminder.
If you have an account but have never commented, please leave a comment on the article of your choice — and if you want a shot at a $25 DriveThruRPG gift certificate, leave it on the contest/purge article. Thanks!