The difference is that the stock market has a very distorted definition of value.
If you say that the value of something is what someone else is willing to pay for it, I could trade my house with a friend and say they paid a billion for it, except they paid me with their own billion-dollar house, and we would both become billionaires. Of course, that would be bullshit, but if my friend and I sat on the board of the FED, it would somehow become actually real.
I see how that works, but the question is, how far can that stretch? Wall Street already tells us there is stuff worth more than 40 years of the US GDP trading around in their pockets, so how much more can that get before they get called on their bullshit like me and my hypothetical friend?
In which we all participate whether we like it or not.