[programminggeek]

For the same reason Tesla built a roadster to start their company. Low volume and high margin is MUCH easier to achieve when you are small than high volume and low margin.

Watch Shark Tank for a while and you'll realize that even if you have a product people want, it's not trivial to scale a physical product business unless you have significant capital. Even if you reinvest the money you make, you are constrained by how quickly you can turn the money over.