I think you may be wrong in the 'making a ton of money' assumption. I've only been to Five Guys once and was not impressed. It wasn't an experience that said I had to go back. With that being said, what do you get for your investment of almost $400,000? Is the franchise fee a one-time deal or is it an annual fee? What other fees will you pay to corporate? The reason you go with a franchise is for name recognition, advertising, and consistency/quality of product. Name recognition - well it's not BK or McDs. Advertising - can't say I've ever seen any of their advertising on TV, web, or newspaper. If I did, it wasn't something memorable. Consistency - I've only been once so can't speak to that, but it's only a hamburger and fries - shouldn't be too hard to keep it consistent, once you find a quality product. Startup costs of $150-$360k will probably not include the purchase or rent of a building.
So my summary on this initially is that a 'Five Guys' franchise anywhere is not going to make you a ton of money. You can probably open up a burger joint under your name in Charlotte Hall for half the cost and make just as much money. But the food business is a tough business, so look at a different industry. JMO