White truffle shavings, creme fraiche, caviar, and fresh roe are just as bad as putting ketchup on a hot dog. Maybe worse. Charging this much for a hot dog is really to either get in the Guinness Book of World Records or to generate publicity. The "haute dog" is usually the creation of a bored chef looking for attention and/or to satisfy his ego. If these people really think a hot dog is worth that much, let them try to survive selling only $80.00 hot dogs. They know they would all go broke.
I would never pay too much for a hot dog, but if I was inclined to, I would rather overpay for a quality dog with mustard only rather than all the fancy toppings that only disguises the true flavor of a frankfurter. THE EMPEROR HAS NO CLOTHES!
See here for a good thread on the same topic: http://www.roadfood.com/Forums/The-69-hot-dog-m601962.aspx