a lot of people throw weight at random big sites when they're afraid of having too many incoming links.
If members have too much weight, what do they do? Good question... Well, I suppose you could always buy more sites and market them through the co-op program. Seems a waste to have excess weight hanging around doing nothing. Yeh, you have to be careful if you get too many incoming links.
I have see some sites with nearly 1 mil backlinks for finance terms, Autogen crap and get links back. I am sure sean has plenty of spare weight to throw around