Last year there was the PowerPot, which is the same principle on the bottom of a cooking pot http://www.kickstarter.com/projects/david-toledo/the-powerpo...
http://www.kickstarter.com/projects/tpod1/tpod1-thermoelectr...
$50
The tPOD5 can charge a smartphone, it's a bit more expensive, and doesn't run on tea candles, you put it over a camp stove.
Point is, these things exist, this kickstarter doesn't seem to improve on any of them except perhaps make the designs cheaper, but they cost more. I'm sure they can make a nice profit on these devices if they sell, and if they can handle their manufacturing costs. If not, it would be cheaper to buy one of the alternatives and ship it to people instead of running your factory.