It's the same with schools. My kids are at an eco school with a maximum of 12 in a class, and 3 classes in the whole school, by choice. They will not 'expand' but encourage other schools to start up and follow their model. It is all about sustainability. Like the Transition Towns initiative - small communities leading the way, because governments don't initiate. They don't lead.
http://www.transitiontowns.org/