I think it has very little to do with any feel good I want to be independent thing. Most I talk to and have known when you dig a little deeper simply think they can make more money that way. Most find out they dont.
Those two things aren't mutually exclusive, though. As a matter of fact, I'd say they're very likely to be related on some level. Now, I'm not saying you're not right. Larger companies have more access to more loads than do smaller companies(AND more competing drivers). But when people can come and go as they please, work or don't work when they want without being pressured by their "non-employer", they tend to work less and take more time off. It's typical human nature, whether they admit it or not. It's harder to stay self-motivated sometimes, and so working less = making less. But in that case, making less because you get more time off might not necessarily be a bad thing.
Ultimately, that's what we're all doing out here. Selling off bits of our lives in the form of time invested for a profit. I don't think having the option of hanging on to a few extra bits is necessarily a bad thing.
EDIT: I'd like to be 100% clear here, so people joining the discussion fully understand. I'm not arguing
against exclusivity and big carriers. I really think there are advantages to working for them, and some of the exclusive carriers who take fair percentages are really the best places to be in the business. That said, many(most) of those carriers aren't taking on new (cargo van)drivers, and if the option is: 1. Work for a crappy big company that pays poorly, demands exclusivity, and doesn't have a strong positive reputation, or 2. Go the Multi-Carrier route, then I think #2 is the better option. I was personally in that position, and that's the decision I made.