I've spoken to people who've done that... they just ended up with a massive debt, and fallen behind everyone else who had already gotten experience to give them a clue to what they might want.
So, basically, even passing all your classes and getting your degree doesn't guarantee anything. Thus, there are only two good reasons to go to college:
1. You know what exactly what field you want to work in, and a college education will help you get in.
2. You want to have the "college experience," socialize, make contacts, get involved in the school, etc.