It is very expensive to produce something like this in small batches. $50,000 is the minimum to break-even on producing this (assuming I work for free).
$20,000 will go to tooling to make the plastic enclosure and aluminum end caps
$15,000 will go to circuit board, sensors, electrical components, battery, and packaging
$10,000 will go to FCC and CE certification process
$5,000 will go to Kickstarter and Amazon for fees