How about deleting inactive accounts so that we know how many actual posters we have.
Something like:
Delete inactive accounts after X days, where X is the number of posts made by the account; if X < 15 then X = 15; if X > 365 then X = 365. That way people would have 2 weeks to post something when they join. Any post you make gets you a minimum of two weeks, maximum of a year (for people with over 365 posts). If you go look at members, and sort by join date, you will see a TON of people who posted about 5-10 posts, and haven\'t been here in over a year.