At one place I worked we were we were in a monopoly position and multiple companies were forced to buy from us.
Still we were barely were scraping by.
We were forced to spend a lot of time to do tricks to make Windows 7 behave like Windows.
We couldn't take opportunities that showed up as the only ones who knew the software were SW engineers in another country, and they were unreliable.
We could have lived comfortably since our software was almost mandatory and we were the only supplier.
But we struggled badly and pay were late on multiple occasions and I was happy to leave after some years.