Interesting fact here ~ when they're adding up all the costs etc most people including myself at one point would say, "that's such bo**ocks, what about all the hours that Ed's put into it as labour?!".
Well the reason I've heard that they don't take into account all the man hours that Ed puts in is because the whole idea of the show is that it is something you at home can do yourself, ...and of course you wouldn't charge yourself for labour.
I only heard that a while ago and the show makes much more sense when you think about it like that.