I would imagine that it's a strategy to avoid one big burst of activity and then trickling down to nothing. By letting in 100 at a time, everybody tries the pr

I would imagine that it's a strategy to avoid one big burst of activity and then trickling down to nothing. By letting in 100 at a time, everybody tries the product spread over time. They add comments to things, which alerts the people who joined a week ago, to get them to come back, and to inform them the illusion that it's an active community. Zurb seems to me to have more marketers than it does designers. :/