NNNNOOOOOOOOOOOOOOOOO!!!!!!
Not that it will be a problem here, but my experience with ranks and post counts tends to be that you get people trying to push their post counts and ranks by spamming. Or people with high post counts feeling they contribute more to the forum and look down on those with fewer posts as "n00bs".
Having said that, MB has so far been fine, with mature and adult contributers (well.... apart from myself probably hehe), probably wouldn't be a problem here. It's just that I don't really see much point in ranks.
Sorry for my Darth Vadery "no" there.
I'm just not really a fan. a tagline or "rank" type thing where you can personalise it and have your own title, now that's cool