Well, why is a "The Card Players" worth $250 million as opposed to a revenue generating company that's valued at $250 million? Need there be a mechanism to keep down the value of paintings as well? The only things I can see that need some kind of price conrtol are those things that people need to lead a normal life. Food, clothing, housing, etc.
Don't get it confused, the reason that there's a mechanism in place to keep prices down is so that people with little money can give it to the rich. If stock prices were super high, the only people that would be participating are the rich which means they would be taking each other's money.
Yes, naked shorting is another level of ridiculous by being able to borrow and sell something that doesn't exist but other than the stock market, where else can you sell something you don't own and at the same time drive down the price of something that someone does own?
Market Data 
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