Yes – it's a fair point that effectively you are buying a one-off, so economies of scale of large batch production to a single design don't apply, so most fo the cost is man-time/skill/expertise.
I think the point I was going for was that, for most people, if you can find a frame that ticks most of your requirements and fits pretty well for 1/4 of the cost you'll go for that, rather than something that will be made to measure to your exact requirements for alot more. I guess there must be space for both in the market though, esp at the procution rate (30/40 a year?) that Hammoon are talking about.