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Again with the denigrating of sex work. It's a pervasive and ancient part of human society, but it should not be studied, because? We study bookmaking and banking and families and art, but not this because, it's naughty? it's taboo? it makes some uncomfortable? All that is a clear sign to me, that we need more such scholars.
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1) Pornography studies can be an aspect of sociology, and it's not uncommon for sociologists to specialize in a narrow area.
2) The study of pornography isn't all that narrow to begin with. It's something that has driven technology to a great extent, in particular media and web functionalities. It's something with thousands of years of history and with literally billions of people involved as producers or consumers. There are probably very few people reading this thread who have never viewed a form of it.
3) A job can have a poor financial outlook even if its subject matter is worthwhile.