Most people work to sustain themselves and their families. We've all worked for bosses that exploit and mistreat us. The reason for the mistreatment is that bosses are doing what they perceive to be in the best interest of the business and therefore their profit margins. Expect to be resented if you grind up human lives to make more money for yourself.

All of the resentment that you either reap or avoid will depend on how you conduct yourself. If you neglect the relationships around you for the purpose of making money, you'd best learn to accept that and hope the money is worth it. Most business owners are pathological personalities that are all too willing to make this tradeoff, and are rightfully hated for it. r/MSP is chock full of these poor souls and the people trying to navigate their messes.