re: Most expensive shot?

I would generally never drink a super premium that way just because of the economics of the thing. I have had plenty of super premium whiskeys, but only because I've splurged and bought a bottle. But I'm pretty particular about it. I'm willing to pay for something because it was expensive to produce (frequently due to longer aging) or simply because it is really good. I am less interested in paying a lot more for something just because it is scarce or spends a lot of money on promotion.