Then there's stuff like this. Where there just aren't that many games like it. Echochrome, Antichamber, Monument Valley, Oquonie, and Fez feel like they're in a similar category, and I would happily throw more money at clever games like that. I'm super stoked about The Museum of Simulation Technology and Miegakure for the same reason.

To go along with another commenter who notes that if you've fans, you're set: if you work in a sufficiently difficult or niche genre with a following, you've got a head start. I'll buy damn near any space-warpy game just on the off-chance I get that fix for a clever and unexpected plot twist; in this case probably a literal shift in perspective.

Edit: spelling and +1 game