Well, if you put wheels on your grandma, she’d be a bicycle.
Or in this case - if you put together a 'whimsical' unicycle and charge the same price as for a small car you don't get a car but a very expensive whimsical unicycle.
Obviously the idiom has now been stretched to a fairly tenuous analogy, but I think this is the same complaint in different clothing: “this doesn’t have half the stuff I want from a camera, yet it costs a pretty penny”. It ignores the fact that it does have some things that some people do want from a camera (and it’s also easy to overlook the undervalued point that it
doesn’t have a number of things that some people
don’t want in a camera).
Essentially: a whimsical unicycle looks like a duff product if what you want is a car. But if you actually want a unicycle, you’re in the market for a unicycle. And if the starter of the supply chain and the nature of product design and low-volume markets are such that unicycles seem like less value for money than cars, then that’s just how it is. If what you want is a unicycle then you have to pay what a unicycle costs. The price of a car is completely immaterial. It’s not like deciding between Car A and Car B. When you want a unicycle and not a car, and there’s only one unicycle on the market, the question is simply “am I prepared to pay this price for this unicycle?”
(And I speak as someone who, whilst having failed miserably at unicycling, has at times had bicycles worth more than my car

)
My view is that at the stated price this device is cynically and horrendously over priced for what it is. The gimmick aspect risks making a joke of the X brand.
I think it’s completely reasonable to put oneself in a potential buyer’s shoes and question the price tag. But one aspect of being in those shoes is to appreciate the unique characteristics of this (or any other) camera and what it brings to the user experience. Lots of people seem to struggle with that and still view a unicycle through the lens of wanting a car. In order to make a proper value judgement, you’ve really got to first fully grasp the appeal of the unicycle.