This $650K table is not a real product, it is one man's dream and it is a prototype. There is no business and there is none for sale and there may never be one for sale. So what are we discussing now? Do we want to discuss whether any turntable is worth $650K or do we want to talk about how long it will be before we see $650K turntables on the market? I just don't see where there is much to discuss with the OP.
Are you even sure it is that? I find the feasibility of investing enough R&D, design, technology and fabrication into a product that mature to come up with that kind of price, even a speculative price, a bit much to wrap my head around, frankly. Here's $500K:
Keep the change. Send someone to a really good state university with it.
Tim