Forum Moderators: rogerd
In the past I've sent out periodic (automated) emails basically asking if they still want their accounts. This usually leads to a lot of people requesting their accounts deleted, plus a short-term bump in people signing in. I've found that the vast majority of people who have inactive accounts will never become regular visitors, even if they return a few times after I send them the reminder email. Think it's best to just clean these accounts up and forget the emailing?
I know some forum operators will keep these inactive accounts around indefinitely to pad out their numbers: "We have 20,000 users!" Okay, but only 1/20th of them are active. I find this to be unethical, especially for those trying to attract advertisers this way.