You don't think an electrician in a big city with their own business is pulling down six figures?
My wife is a doctor of physical therapy who owns her own business. Most of her job is marketing and paperwork.
If you want to throw the title Business Owner in front of a career title, I'd still suggest Electrical Engineer business owner over Electrician business owner.
I wasn't really talking about someone who employs lots of other electricians.
Edit: thanks autocorrect.
If Joe was good at business he could keep 200 electricians busy with jobs that pay about as much as they would earn on their own, and no need for them to do all the book work in the office, and ultimately Joe makes more money.