I have just read this thread. It took a long time. I am not knowledgeable about Tannoy speakers (but have enjoyed them the twice I have listened) so no comments here.
I have a couple of points to make though.
Firstly several posters mentioned the superiority of a single 15" unit over multiple small units "because it hardly moves". Well clearly that depends! 4 8" units will move -less- than a single 15", and have 4 motors. I am not disputing what is heard, I haven't compared a speaker with a 15" bass unit with one with 4 8" units... Just sayin'
Secondly when I worked for Garrard in the 1970s manufacturing cost being 10% of retail was a fact.
The manufacturing cost being piece-part plus assembly. I was told this was industry standard, apart from Linn who priced based on what the market could stand (ie -much- more than 10x manufacturing cost at that time, its a fashion business ;-)).
Now at that time all punters expected a 30% discount, so this was factored in to this markup. IIRC the dealer markup was 15% (+ the 30% to allow for a discount to match Comet), distributor margin was 15%, Garrards margin was 10%, the rest went on tooling, R&D and general infrastructure investment.
Yes thats right, the company with the highest skill, most employees and biggest risk had the smallest margin, but otherwise nobody would have stocked it.
We looked into supplying a full range of electronics at the time, since many dealers were forced to stock (and aggressively market) turntables by the Japanese majors if they wanted to sell the electronics. A highly regarded cassette player sold by Pioneer for >£100 was available from the OEM for £9, if we wanted it. And so forth.
It is not just HiFi, the only other product I have in depth experience of is cars, and they are about the same.

