Put simply, I like Macs and the MacOS, and have an inate understanding of how they work and why they don't, when they don't.
I love to solve problems, to walk away leaving a Mac in better shape than I found it.
And I love running my own business, and earning the trust of my clients. I learn from my clients as they learn from me, and teaching is a great fringe benefit.
And, of course, I make money doing this...