How quickly (and disappointingly) the disruptors become the new rentiers .
But, when you want to run a business? If you ever want advice from a business person, If you say that your market is at all commodity, they tell you to quit straight-out.
It bothers me, because I have a really hard time honestly selling another person a differentiated product. Obviously, it's not in your best interest to depend on a product or service you can only get from one place, so obviously, if I am trying to sell you such a product, I am asking you to act against your own best interest, and that is not easy for me.