For starters, any no talent fool can work in Vegas if they have the cash behind them. I'll not mention names, but there's one blond bimbo that's played there for years and is known in magic circles for being one of the worse technical acts going (she flashes dove pans, for christ's sake).
BUSINESS is the key, even Mark Wilson has a business degree or three with Marketing being his major if I recall. But it has a lot to do with which area of magic you want to move into; big illusions & revue shows are seriously different from developing close-up type effects & card tricks, there are hugely contrasting skills and knowledge base elements involved. Where business & marketing help in ALL areas of magic Theater will help you more if you are moving into big illusions and even there, at least a good semester in technical theater (sound, sets & lighting) will take you far. On the other hand, if you were moving into big time Mentalism you would want to invest into learning Psychology, Hypnosis, Communications and even Counseling Techniques.
So you really need to know which direction you want to go in the future while making school plans. That means you need to spend time figuring out a few things, such as which arena is most practical to you and your situation. Big Illusions are bloody expensive in that it involves a lot more than buying a dozen or so funny looking boxes that cost a small fortune; you need lighting, sets, costumes and in some certain cases you must be certified as an animal handler, pyro-tech and other specialty elements. You'll want to learn a bit about cabinet work and how to properly build props as well; that would include the fine-tuning elements when it comes to deceptive construction and paint finishes.
As you can see, there is a reason why the majority of magic buffs stick with a deck of cards and a fist full of coins . . .
BTW. . . one very successful illusionist that didn't have a business degree originally, was Franz Harary. . . he's a classically trained Opera Singer (or so I've been told by mutual friends).