The real reason is that they don't get to play one founder against the other.
Now you know.
It's interesting that Jordan was invoked as an example of Hero Ball. He didn't start winning championships until he had all-stars around him. And he elevated them - Pippen would have been a lesser player if teams could afford to double-team him. Jordan gave up salary to get other superstars around him. This is the opposite of Kobe.