Interesting design, to be sure, and attention to quality. The latter is rare these days. I think the ideal measure should be the best that can be made, as opposed to being the cheapest gun that will cycle rounds. I like the idea of a semi that can compete with a bespoke sidelock double on quality of design and build. I would love to see a Cosmi in the flesh.
It always strikes me odd that almost all gun designs have been pulled out of a remarkably small number of brains... and especially in the case of repeating weapons. John Moses Browning is a name familiar to all, but his son, Val, came up with the Double Automatic (an action I'd like to see built and stocked to the same level of quality as the Cosmi in the video). Christopher Spencer came up with the first pump action. More names come up in pistol and rifle designs, like Samuel Colt, Benjamin Tyler Henry, and Sergei Gavrilovich Simonov. Many famous names simply built on their ideas, like Peter Paul Mauser building on the brainchild of Johann Nikolaus von Dreyse, resulting in all of Mauser's bolt-action rifle designs. In the area of semi-autos, I guess Rodolfo Cosmi can be added to the list of creators, as his design is inspired by, but not a copy of Browning's long-recoil A-5. A break-open semi-auto? Remarkable.
As to price, there will always be those who will choose the best, and swallow the cost. It is nice to admire a beautifully-made gun, and clever design, even when such guns are priced well beyond our means.
Thanks to the OP for posting the Cosmi video.