See, the sandwich is mostly expensive just because it uses really high quality ingredients. But this sounds like a mixture of really high quality ingredients... And useless additions that jack the price up several hundred, if not making 99% of the cost.
I'd buy the sandwich, but I'd only want to see the sundae, then try it out without the gold covering and crap. :P
Edit: Though caviar with ice cream just doesn't sound appealing. The rest sounds pretty good though.