When people register and never post, I have no idea if they are people who actually come by to lurk, are spammers or if the account is just dead space in the database.
Starting in about a week from now, every once in a while (probably every few weeks), I'm going to purge all the accounts that have zero posts AND are more than 3 months old.
To prevent your account from being deleted, please make one single post, even if it's just to say "Hi".
If you end up being a victim of the three-month-zero-post-delete, don't worry. The account will be totally GONE, so you can just create a new account with the same name and info.