As others have said, Woodlore is a business, simple as that. Ray does not say he will teach on the courses when you look at the site, and with his reputation at stake he can't afford to offer low standards, his instructors must hit the mark I would have thought.
£600 or £700 for a weeks course? cheap really, try booking a half decent Hotel for a week and see what that costs alone.
His shop is expensive? Could be on some items but you don't have to shop there, and his setup is not amazon.com or sitting on piles of stock so his prices reflect this perhaps.
The Arctic course run by Lars is two grand plus flights so say £2500, thats not bad when you look at what you get. With 15 pupils in attendance thats £30K revenue, take out the costs and the short time the course can run over a winter and its not rocket science to see you won't make millions from it.
Lets be honest, there are a lot of members on this forum who would not be here if RM had not been on the telly and sparked an interest so credit where credit is due, the man has done a fine job. He's 44 years old and doing OK for himself and long may he do so. Give the chap a break for crying out loud.
Just team up with other woodsmen campers in your area and you can learn for free, although you don't get a certificate or can boast that you've been on a Ray Mears course