As part of our new site, we've been clearing out member accounts that have been inactive with no posts for several years.
For the accounts that have posts, but have not visited the site for more than a year, the accounts go to "inactive" status which still allows the member to log in, but limits their ability to post or edit. If your account goes "inactive" notify a moderator or admin and it can be quickly reset to have normal access.
By culling and monitoring member accounts, we reduce our database overhead, make indexing a bit faster, and we have a more accurate "head count" of our site.
Thanks