The point being, the more they give out, the more people will request innane titles for themselves.
I think there are somewhere around 100 "elite", and the few others like AnandTech staff titles, and Den Mother. If they give titles to distributed computing members...well, how the heck are they supposed to keep up with that? Seriously. Make a post in DC, and you become a member?
I for one wouldn't want to have part of my daily routine being keeping track of who's a new member of DC, and who stopped (especially the "who stopped" part). They could give it based upon certain milestones, but then it becomes a title based upon who has the biggest herd/fleet/whatever-you-want-to-call-it.
It's just not practical, unless they get about 20 mods to keep track of nothing but titles....and that's kinda pointless, IMO.