Stacking doors are hellishly expensive. We had one installed in the house we recently built to open up the living area to the patio. It was about a third of the size of the one you posted and not frameless and still cost a small fortune. So yes, I can see how one can lust after it...
I must say, after the new house, PS4 and new gaming PC all in the last 2 months, I'm pretty happy. Would like a double-cab bakkie, but I don't lust after it. Biggest desire right now is children, but wife isn't ready yet.