Why is photography poor for three generations, and the salary of photographers is really low?

In the photographer industry, most of the income is very average, and high-income people are also a minority. Compared with other industries, the per capita GDP of photography industry is very low, which is much worse than that of beauty salon industry.

If a young man chooses photography as a career, it is basically difficult to make a fortune. If he works hard enough and is talented enough, it will be good to live a well-off life. It's really hard to get rich.