This is an easteregg location. If at all, you use the dude in Boneyard Downtown (Fallout 1) who is a nuka cola addict as an argument.
falloutistic way:
the probablities of a adict enough smart for create Nukacolas from nothing, with the correct chemics, bottles, bottlecaps and sell it for low price is imposible
a guy dealing those nukacolas that coming from nowhere without any logic explanation, with a bike in the desert sounds more real, in fallout terms