well the active members is currently running at 2100 which is the amount of individual members that have visited in the past 30 days - 2100 in 30 days out of a total of 5000 is fantastic!
It is worth remembering that we moved to vbulletin close to the end of 2007 so these 5000 members have signed up since then.
We also have implemented lots of anti spam bot measures and so the vast majority of our members are real. Ive seen other forums I have put up for testing purposes have 20 new members in a week, all of them spam bots so its good that our member figure is pretty accurate.