Like almost all other business, it comes down to the person running it and the intentions they have, as an example, take construction company's, some guys work with a few tools out of their hatchbacks locally, and some guys build skyscrapers all over the world. Or compare UFC to a local bar brawl promotion, there is always market opportunity pretty much anywhere you are to work with.
Also, over the years I have trained at least 20 different dojo's/clubs in 8 different disciplines, in three provinces across Canada. Some were lavishly equipped in large buildings owned, and some were broom closets run by punch drunks in low rent warehouses.
There is plenty of money out there for the right qualified martial artist with good business acumen that gains the respect and trust of others.