A photo studio is a small business. Many are successful. Why wouldn't such a business count as a viable startup/business?
I should also point out that there are quite a few successful photography photography studios that not only have employees, but also pass their business down to successors, so they DO outlive their founders.
In the end, it's honest work for honest pay, which in my experience is not the case in IT, which is usually a waste of talent. I've worked in the IT industry for 17 years as a software developer, and most of what I've seen is that most of the developers in the industry make up for a complete lack of talent and skill with a lot of hackery and long hours.
I've never said that all studios are like this. It just seems to be that most are.