Anyone else think he was valuing his time too highly?
Also, considering what someone with a similar background could earn working full time for an established company (especially factoring in benefits), $50/hr is fairly conservative in terms of opportunity cost.
It also doesn't matter, because I still think the opportunity cost equation holds. If you decide now to become a waiter instead of an IT consultant, it costs you 70$ an hour to be a waiter (assuming waiters earn 10$/h and consultants 80$/h). I don't think there is a way around that.