I suppose you could start a man-drawn carriage business and pay the men with sex. You might have to lobby to get a few laws changed first. Or you could have the men run on hamster wheels connected to turbine generators…
There are even niches within foot fetish porn. Like people with a fetish often have a very specific kind of fetish. Foot fetishists aren’t just into feet but for example also want to see the feet in specific color nylon socks or have a humiliation fetish. And most of the niches are probably underserved.