There might be a startup opportunity here. If these devices have a real economic use -- spotting heat leaks -- and the only available alternative is orders of magnitude more expensive.
I don't do hardware (although this project looks simple), but it would be interesting to own one of these and a lot of people like me might be willing to part with a few bucks for the privilege of owning one (especially if it helps spot leaks that are adding to the heating bill).
It's basically an IR thermometer that outputs a color instead of a number reading. Those "gadgets" are already pretty cheap, so not sure if replacing the expensive passive display with a 15 cent rgb led would make anyone profit.
Not sure how much profit it'd be able to squeeze out of the IR thermometer market, which are already in fairly common use (the building maintenance people at work use them) and it looks like you can get one for as little as $25.