That only counts if they're not using deceptive and immoral tricks to bring in more cash. There's two really nasty things the investor class is doing that invalidates your argument.
First, they pump, dump and then get bailed out as too big to fail. They've been doing this for at least a hundred years, maybe longer. Please read
this and maybe even the book it references.
Then there's the more recent phenomenon called getting "Bained". Remember Kay-B-Toys? Mervyns? They weren't failed companies. They were doing just fine. They got bought out by venture capitalists who used their good name & credit to borrow a tonne of money, pay themselves huge bonuses, and then shut the whole thing down. Ever wonder what happened to all those cool Sci-Fi anthologies from the 70s? Issac Asimov's Stories and what not. Folks didn't stop reading them, their distributor was sitting on a mountain of valuable property they weren't keeping track of. Some wealthy asshat noticed, bought them up and liquidated them. Suddenly no distributor and being small but successful they collapsed before they could get another one.
So even if I ignore the fact that just about every rich person relied on the gov't directly to make their fortune, even if I ignore the fact that they're wealth is largely build on the infrastructure and education system of our civilization, even if I ignore the commons and the meaning of natural resources. Even if I ignore _all_ that, you're still left with a bunch of dirty thieves who couldn't survive in the imaginary "real" world of capitalism that's never existed anyway.