A hot dog is an incredibly complex piece of meat, with a whole lot of flavor coming from a whole lot of different sources. It's also best with a proper bun. With burgers, you can just take any old bread that you already have lying around and you're good to go with little prep. And many would argue that the real art to making a good hot dog is the way you combine all the toppings.
Frankly, I think if most people had a properly made hot dog, they'd never go back to eating burgers.