I think it's important that people realize that the traditional publishers saying "There's no market for this" are probably not entirely wrong - if they just made this game and shipped it to stores at 60 bucks, I would be shocked if it made as much money as they would need it to make. It's just an entirely different type of funding at play here.
Look at Pillars of Eternity, even if it sold decently we've still got someone like EvilLore getting the tier where his portrait is in the game. That was 3,000 bucks. A digital copy of the game was 25. Now, there's obviously a bit of overhead depending on the reward tier there, but in this case it's basically commission the piece of artwork to be based on a photo he provided rather than whatever else was coming. That's essentially free for them, an awesome reward for EvilLore, and they managed to sell the equivalent of a hundred and twenty copies of the game to a single person. With a full retail product that's never going to happen, if Iga just 'made' this game there wouldn't be some magic guy that went 'oh I love this genre, I'm gonna buy 120 copies of the game to show my support.'
Anyway, just wanted to elaborate a bit on why it's especially helpful for niche products like this.