The way I see stuff like this...
Say it is genuine and someone pays $100k for it (remembering this watch is probably only worth this much $$ to maybe 25 very strange people in the world). I sure would hate to get caught with one when they go cold. Or maybe the guy who buys one of these things 'buys the farm' soon after the purchase and his dopehead son/daughter/nephew/third exwife finds it and sells it to the nearest pawn shop for $500. Maybe the guy just loses it down a drain. It's still a lo$$.
If the watch is a replica...$2000 will knock it in the head if the movement is genuine, but it will probably not be worth any less for a long time so if you were to put one together it would not be too much of a gamble imho.
Things like this are 'generational collector items' and when all the 'investors' go broke, lose interest, wise up, or go RIP, this stuff may not worth much. We are also seeing this now with 'supercars' that I could have purchased in like new condition for a few thousand $$ 'back in the day'. I did not pay much for them back then and am not (fill in the blank) enough to buy one at today's prices. I have friends with restored or low mileage 1960s/1970s supercars and the cars soon become a full time job just keeping them from rotting away...rubber hoses/tires/upholstery dry out and crack, engines develop leaks, gasoline goes dead and sets up in carbs/fuel lines (so the owner runs the car every now and then to prevent gasoline damage and the short run time causes condensation that rusts holes in the $3000 exhaust system), 'pop top' batteries leak acid on shiny stuff under the hood, brake fluid turns into pond scum, rubber axle, crank etc seals dry out, exterior paint dulls, plastic dashboard parts/steering wheel rims etc crack...and when you finally get up enough nerve to take one of these trophies out for a Sunday drive, some Idiot with no insurance runs over it while texting his best friend Bob.
This is why they make replica watches and brand new 'pay by the month' supercars.