It either means inflation is incredibly high, productivity growth is incredibly high, there is some exotic "dark market" that most investors cannot access (probably made out of dark matter) or other people are losing a lot of money.
Except inflation isn't high, productivity growth isn't high and I just made up the "dark market" so only one explanation remains.
Even so, I must admit, their profability and success is outstanding. But then again, so are Apple’s and Google’s. The only difference is thst no one knows how RenTec makes buttloads of money.