In order to make money you need to sell something for more than its production costs you. You can either sell something at a small margin to a lot of people or something at a big margin to a few. Selling at a small margin to few people doesn’t make you a living and selling at a big margin to a lot of people just isn’t possible. Selling at a big margin to a few people means you need to find a specific community, become a part of this community and sell something to them they want enough to justify the price. Furry porn would e.g. fall in this category. Alternatively you can sell at a small margin to a lot of people. In this case you need to find a bland and generic product so it appeals to a lot of people, and find a method to produce it so cheaply that other people can’t easily undercut your price, and finally find a spin to advertise it to a majority. In this category are all “livestyle products” that sell to underclass white people the idea they’d belong to the middle class. Also selling mainstream books and music would fall under this category.