Buy it does seem that transitioning from a free to a paid for service is a tripping point for many of these VC backed startups. Of course by the time this happe

Buy it does seem that transitioning from a free to a paid for service is a tripping point for many of these VC backed startups. Of course by the time this happens it has usually gone through an IPO, the early investors have made a nice profit, the shareholders start requesting a return, the company has difficulties monetising and the shareholders eat a write down. But the VC makes out OK.