Why is this? As the majority of hobbyists must be aware, most of you steal your software. Hardware must be paid for, but software is something to share. Who cares if the people who worked on it get paid?
If you work your way down the Forbes 400 making an x next to the name of each person with an MBA, you'll learn something important about business school. You don't even hit an MBA till number 22, Phil Knight, the CEO of Nike. There are only four MBAs in the top 50. What you notice in the Forbes 400 are a lot of people with technical backgrounds. Bill Gates, Steve Jobs, Larry Ellison, Michael Dell, Jeff Bezos, Gordon Moore. The rulers of the technology business tend to come from technology, not business. So if you want to invest two years in something that will help you succeed in business, the evidence suggests you'd do better to learn how to hack than get an MBA.
Also, as far as I can recall, (Rumor alert!) Gates didn't really program MS-DOS, or all of it, or something. He bought it from some other programmer or team either in whole or in part for a paltry sum of something like $5,000, and turned around and sold it to IBM for something like11-12 million, either as is or added to and doctored.