While money does not equal happiness it does equal freedom. I am 25, have about a year left before I finish my Ph.D here at Cornell (in chemistry), and am contemplating going to law school for patent law (or tagging on to a firm after graduation so they pay for my law education, a pretty common thing to do for people in my situation). The way I see it, chemistry (or history or an MBA in your case) is not really my first love but if it puts me in a position to do the things I want to do (by way of money) then I am content doing it. The likelihood that I would make enough as a producer or engineer to support myself and my family and still be able to do the things outside of music that I love to do are verrry slim, hence why I didn`t pursue them. I know you see getting your MBA as selling out right now, but think a bit further down the road than a couple of years. What happens when you are a struggiling producer (which can be a very fun lifestyle) and your priorities shift? What happens when you want to start a family? What happens when you want to go take a tour of Europe (and not stay in youth hostels)? What happens when you want to get a place nicer than a shoebox apartment? etc...
I am not saying you can`t make a living being a producer, or that you shouldn`t neccessarily pursue it, just to think a little further than the next few years. I chose to compromise and do something that will give me the ability(aka money) to pursue my passions on my time. I am in a band again and once I am making better money (that is, out of grad school) I fully intend to make a nice home studio big enough for a band to record in. I won`t be doing it 24/7, but I also will be eating things other than Ramen and going to Hawaii at every opprotunity. Its a compromise, but one I am more than happy with.