If it were up to me here's what I'd do:

+display number of posts, date registered, and number of posts per hour since registration date.

+when a new member joins, they would have no title. After 30 days a link below their name would lead to a 48-hour poll that would allow members to vote on a number of different titles that are chosen depending on the user's number of posts, registration date, and post per hour rate. Every 30 days thereafter a new poll link would appear with updated possible titles. Of course this would require a lot of programming and it will never happen, but it is a dream.