The thing is this is hard to pull off even for the actual founders. For starters its just hard, and tiring(and even pointless) to keep jumping over the ever increasing bar. Even more so when you are aging, know you are going to die and you are better off enjoying some of that money you earned, in the time and health that remains. At that point, you let things go on autopilot and begin to reduce engagement with your work.

The middle managers and employees you hire don't have incentive to even care this much. They are neither paid this high to care, nor have much to lose if they don't. Younger people show some passion because they wish to learn, but once they have enough of it, they go on the same mode.

To summarise. For people who made big money making a little extra doesn't matter all that much. People who don't get paid, don't even bother to try.