It's most likely a fake. Signed prints by Haring and Warhol for for a lot more — you can get an idea for how much by looking at Sotheby's/Christie's past results.
Professionals in: VFX/3D (which is why they use Cinebench as a benchmark), game developers (UE4), industrial design. These are multi-billion dollar industries.
I wouldn't say so. There are other heavily shorted stocks that have a much higher short ratio because of their small float (e.g. MTCH).
>but is there a good way to determine who?
Short sellers don't have to disclose their positions, unlike investors who're long the stock. You can try to get a better sense of who's thinking what through headlines and analyst notes/reports.
Side note: Elon tweeted out that we'd see the 'burn of the century' (a short squeeze) and that it would be bigger than the VW/Porsche squeeze in 08.
Mortgage is leverage (debt) and that can be bad. When you buy a house you speculate, to some degree, on the price of the house. I am sure a no-arbitrage condition exists in the housing market so your guess regarding housing prices in 10y is as good as anyone's.
Also, the point about diversification is a valid concern. Would you put (50% of your net worth + loaned money) into only FB/AMZN/XYZ stocks, today (tomorrow)? Probably not.