TrekBBS:
Bandwidth used per month: ~90-120 GB (yay for gzip!)
Pageviews per day: ~140,000
PM Purge: Never (only automated messages are pruned)
Post Purge: 14 to 180 days (depending on forum group)
Inactive Member Purge: Varies based on activity, post count, posts currently in DB - 60 to 360 days. (Custom member prune utility.)
Number of posts: ~380,000 (pruned daily to keep this number due to being on an undersized server)
Posts per day: ~4,000-6,000 (off season vs on season)
Number of topics: ~18,000
Topics per day: ~145
Number of users: ~5,200, 4,000 of which have been active in the past month
Users per day: ~30
Board started: Spring, 1999
Avatar directory size: N/A, local avatars / uploaded avatars disabled
Database size: ~450 megs
MySQL crashes: Never, though it is bounced three times a day for quick backups. It's easier and MUCH faster to pull down Apache and MySQL, then just copy the table files out and bring it all back up rather than trying to do an export from the live DB.