My undergraduate degree is in Animal Sciences and my graduate degree is in Business. My undergraduate degree has been relatively useless EXCEPT during job interviews (between undergrad & grad school) when the requirements stated "Degree required." In other words, like any degree, it's a foot in the door.
My business degree has allowed me to work in a variety of circumstances from the non-profit sector to consumer oriented to B2B sales.
But perhaps the most important thing that my business degree did for me was it allowed me to set up a nice sideline for myself -- my one true love (other than shooting) is photography. I know plenty of photographers who, for lack of any business sense, are working as waiters, cab drivers, etc. I, on the other hand, have a hobby that's turned into a money maker (unless you're from the IRS -- then it's running at a loss).
Bottom line: If you have any entrepreneurial tendencies, business training is invaluable in getting you on your way and can either keep you out of the office life or at least give you something that makes office life a little more bearable.