1. This has not been my experience. I've sent my resume to these kinds of companies "non tech" companies, at various periods and have had no trouble getting gigs with them (I was consulting at the time.)
2. This is pure prejudice. It may be true for many people, but it is not universally true. Some people go to college having no idea what they want to be. That was me and I studied physics but it quickly became clear that software was what I cared about (originally I thought it had been electronics.) It wasn't the exposure to physics that made it clear I wanted to do software. Plus the terrible "exposure" of college to Economics, Sociology, Philosophy, and History turned me off of those subjects for a few years... then later, I started reading up on them, and have become more proficient in 2 of them on my own than I would have been if I'd majored in them in college. College doesn't make you more well rounded. You can sleep thru all those classes. Its not like you can't order all the literature you want from amazon.com, or see great paintings at museums or on the internet. What it does is force you to spend time on things that are outside your subject area-- and that would be valuable if college delivered anything useful about them, but it doesn't. Those classes are a full employment program for liberal arts graduates.
3. I think you're speaking from a lack of experience here- because if you'd ever started and grown a business, you'd know it has an impact on many aspects of your life. For instance, my deep love of history and economics were as a result of starting and growing a tech business. Economics is important to business, for obvious reasons, history less so. Further, your response shows a form of anti-intellectualism that is the real crime of colleges. They actually teach people not to think, in a way, but to believe. The anti-business perspective is a real shame, because its actually anti-life. (It was my study of philosophy that helped me understand that.)
4. A degree shows nothing, and is not required. You only think a degree is required for advancement because you've not been working in the real world. What determines advancement is performance usually, though often politics and the external state of the company with regards to your area of it (Eg: having a good year or not.) Nobody remembers you don't have a degree.
5. Starting a business is better than being an employee of a little startup, which is better than going to college. But yes, you can do either while going to college, though you're trading off the amount of education you'll get in favor of spending time at college.
6. People who need their life experiences broadened by college aren't really going to get it in college. Oh, wait, you're talking about partying, right? At any rate, I think you've got a false dichotomy going here. Whether you are broad minded and well rounded is determined whether you are curious about things and follow up on that curiosity, not being forced to sit thru some really low level "education" in subjects you're not interested in. It comes from pursuing your interests without regard for which subject matter they lead you to.