A few observations:
Those vans that are grabbing loads from several carriers without their own authority aren't really independent in my book. They're still running freight under someone else's numbers.
What precisely is the difference between a carrier and an independent? Absolutely nothing. Just the number of trucks. It seems that a lot of folks think that a carrier is one of those companies with an advertising banner on here and a large dispatch office, etc., but one guy booking and running his own freight is called "some independent." News flash here. There's no difference. If you have your authority, you are a carrier and with that comes a certain reponsibility.
As a carrier, you have to get enough money for the load to pay the truck and the carrier to still make a profit. That's what I did when I got my authority. I assumed that I (acting as driver) got X amount of money for the load and then my company also had to make something above that. There's no point in going through the trouble of looking for your own loads if you're only going to run them at the same rate you would get leased on somewhere else. You need to be compensated for the work you're putting in, both as a carrier and as a driver.