If that's case, then you should probably make them and sell them for half the cost and be a millionaire in no time.
I mean seriously... you can put a big block in a Yugo and it could go really fast and beat a Ferrari. However, there's more to $400K car than just the speed. You're paying for design and beauty. Sonus Faber makes some of the finest speakers and certainly some of the most beautiful ones. I guess I can appreciate it for what it is and who's it's intended for.
That is a point but I think my rig actually looks very good. However, I agree producing it would be very costly. The mains are really heavy at 350 lb a piece.
Development and build costs in 2005 were $13,500 near enough. With inflation that would be $22,000.00 now. That does not include the cost of the active crossovers, which I had and modified nor the amps. If you estimate crossover and amp costs, then you would have to add another $8000.00 roughly or so if you DIYed the job now I think you would be in for about $40.0000 at least. But that is a long way from three quarters of a million.
The speakers are also transmission line and a fully integrated full range design. They are also voiceable by infinitely adjustable BSC (Baffle Step Compensation) so that the transition frequency can be optimized to the speaker position in the room and boundaries.
I also had as my starting inspiration the legendary monitors from the BBC studios Maida Vale. These speakers were widely recognized at the time as the most accurate monitor speakers in the world. My speakers are an extended development and lean heavily on the work of George Augspurger, published in 2000. This allowed for the design of the TL lines to be optimized.
Not as pretty as the Sonus Faber, but they follow form and function.