There seems to be a strong positive correlation between creativity and kinkiness that can definitely be a lot of fun to explore.

For example, in the area of hackable unconventional sex toys, ideas I haven't seen here but that may be worth exploring: solenoid valves (to control fluid or air flows? — test! — have emergency release valves!); linear actuators and a few pumps (see above); in-line flow meters (to measure them? Interesting elements of breath control possible); pin lattices with solenoids/linear actuators/similar (programmable textures?); and, of course, inexpensive accelerometers.

Things I have seen, and played with which have been variously modified include certain TENS units (not really a fan) and 'violet wands' (a fan!).

There might be product ideas here, but they're likely to be kind of… niche. Still, kinky people can host quite dedicated niches sometimes (and that's about all I'm going to say about that here! <g>).

Our initial feedback has been super positive. In particular, it's really awesome to have your toy respond to your (or your partner's!) heartrate or bump to the music, or even just tweak a vibration pattern to work for you. Everyone likes different stuff you know?

But also, hackable is really another word for customizable. Lots of vibrators on the market have buttons to increase/decrease intensity and alter vibration behavior. We're just trying to get down to the core of customizable, but also keep it super easy for people to do. Our goal is to have a bunch of click-to-download programs that let you easily modify how your toy behaves without having to get in to libraries and header files and debugging.

IMHO, the market is bigger than most of us probably think, but even if it's not, what market there is will be loyal and interested.

I think you'd be surprised; this gave my wife some interesting ideas ... for work.

For what it's worth she's an academic in computing.

Its definitely something I'm interested in, but I'm a bit of a freak.