Why not? That is not just me snarking, I seriously want to know why you think you wouldn't have been able to do what you did unless you learned what you did in school.
Because without the business courses I took, I would have not been able to be a coder that could also start and run a company. Without the marketing courses I took, I would not have been able to be a coder that programmed the site but was also able to design and run the email, affiliate, google, and overture campaigns. Without the accounting courses I took, I would not have been able to program the financial tracking software to be able to monitor and adjust our offerings to make money.
Sure, I could have hired a team of 4 or 5 experts to do that for me, but then I couldn't have done what I did because none of the experts at the time understood the Internet and while $100K profit in a quarter is good for one person, it's not much for a team of 5.
Because I had no idea that marketing was so important for technology types. Most technology types still don't get it.
I would be a very successful mid-level manager today if I was entirely self-taught. I would have done quite well, and I'd be bitching about my boss. Instead, I get to live a deliberate life as an entrepreneur, worker, and hired gun. The bonus is that I am not limited to technology since I've been running my own company for 11 years. I'm a businessman that understands and communicates technology (another skill I got in college) and that's worthwhile in all industries these days.
(The last sentence is a paraphrase of what a multi doctorate told me, so don't take it out on me.)
You'll get no argument out of me on that. Most advanced degrees in technology are useless, as are most BSCS degrees. But that doesn't mean all college degrees are useless.