The convertible roof STORES IN THE TRUNK? That is just an absurdly non-luxurious design decision.
Luxury cars are en entirely different class of vehicle, where I doubt this would ever go.
One of the many reasons that I never understood why one would buy something like a new Lamborghini Huracan, when you for a similar price could be looking at a Rolls Royce Phantom.
If you want a great car (we are of course ignoring fuel costs here), it is the most comfortable thing you'd ever park your buttocks in, and a much more well thought out vehicle. The usual Lamborghini or Ferrari would in comparison feel like a Peugeot 104 on a good day.
If you want to turn heads, this certainly does it better (although a Lamborghini or Ferrari is likely to get more attention from kids).
Sure, a Huracán has a faster 0-100, but if you want to enjoy the car outside of the track, it would be awful to drive in. Plus, it's still slower than a much cheaper production sedan (Tesla Model S P100D Ludicrous). If you're not going to be the fastest anyway, you might as well be the most comfortable.
None of these high-end vehicles hold their value anyway. Hell, there are really no new vehicles that hold their value. Only classics do.
ADDED: As others have noted, trunk storage is fairly common although it's usually not manual.