From Guinness World Records...
“The most expensive hot dog is $169 and was sold by Tokyo Dog (USA) in Seattle, Washington, USA, on 23 February 2014.”
http://www.guinnessworldrecords.com/world-records/most-expensive-hot-dog
There is a hot dog place in my neighborhood that sells a $199 hot dog, called the “Capitalist Pig”... however that hot dog comes with a bottle of Johnny Walker Blue, so it probably doesn’t qualify.