$70,000 is a nice haul, but over six months it averages to a little more than $10,000 a month which at least in the bay area pays for about 1.5 developers. I hope their growth curve is still more vertical than flat.
I had this idea in Jan 2012 and even did the ground work. - Essentially devbootcamp type thing and I didn't pursue it because I'm really bad at teaching people - I get very annoyed very fast :) ...