I don't think many schools would come out and admit they're quiet, unless they had to. But honestly, I don't know the answer to that one.
I'm at a small aero club locally, and whilst having only just started I've already seen a couple of people wander in and ask about training courses - albeit PPL level as this one isn't known for its commercial training.
There was a thread recently on the Flight Instructors & Examiners forum which might be of interest,
http://www.pprune.org/flying-instruc...turn-busy.html - draw your own conclusions!