Seriously, I think most rich people are mentally ill and are compelled to keep accumulating and hoarding until they own everything.
Carnegie became critically aware that J. P. Morgan would totally kill him to take his assets. Carnegie even wondered of such a monster lurked in his own heart. ( Narrator: Yes. Yes, it did. )
We don't know the point at which people get greedy and lose empathy with their subservient co-workers, but even small business owners are stereotypically mean employers.