The phrase "niche appeal" means that something is not widely popular or appealing to a large group of people, but instead caters to a specific, small audience with unique interests. Full definition
Instead, look for niche appeal franchises like car wash, laundry, taxi service, food cart business, etc.. (profitableventure.com)
It's sad that I have to criticize a game for a feature that absolutely works, but in this case Move is, at best, a gimmick with very niche appeal. (digitaltrends.com)
The cycle of preparing your squad, hunting down gigantic beasts, and repeating said hunt for materials required for the next piece of shiny gear is one that has a certain niche appeal. (co-optimus.com)