Ok. For all the folks here who think they're getting stiffed by their carrier, I have news: It's costs money to run the show.
1. The carrier maintains truck liability that far exceeds the limits that they require you to carry. In addition, they maintain high limits of general liability to protect their business, so some schmo can't just sue them for every penny they have, leaving the carrier with nothing to give you for that big run you just did last week. $$$
2. Carriers have staff, which require decent salaries in order to help you 24/7/365, as well as put up with some of your whiny cohorts who are complaining that they're only being offered 150 mile runs. Here's some of the jobs around the office: Dispatch, accounts receivable (they collect from customers), accounts payable (they make sure you get paid), Sales people who must apologize profusely to the customer to keep them, because the last driver there yelled at the girl in shipping, calling an f*ck@#g c*^t, only to find out that she is the BOSS'S NINETEEN YEAR OLD DAUGHTER, who happens to be working there during summer break. Then you have recruiters, who must train you how to prosper in the system. And to think that there will be people who don't show for orientation and those who quit within the next two weeks. $$$
3. They carry cargo insurance on the goods you are carrying, so that in the event of a mishap, both YOU and THEM are covered. Oh, and some don't just carry $100,000 on your truck, they carry a cool million. $$$$
4. Businesses pay a lot more for internet access than you do at home, or on the road. $$$$
5. They must maintain records of everything you do, in order to keep FMCSA happy. Logs, driver qualifications and run paperwork are all things that the fed wants to see. That's why they have such a big facility, so they can keep stuff. After a while, it gets sent to archival, which costs more money. $$$
6. A contractor is generally paid for his work about 15 to 45 days before the carrier receives payment. Sometimes more. The contractor gets paid whether or not the carrier ever does. Who wants to talk about liability?
I've been a contractor before, and believe me, I feel your pain. But if you're going to talk about what if's of being a carrier, then here are things to consider. Why is it a big deal if your carrier is making 40% of the load to do all of the work that you as a driver won't do? After all, you agreed to run for either a flat rate per mile, or a percentage of the load.
Here's a closing question for thought: Putting aside any high and mighty views of yourself, what do you have to offer your carrier (other than holding the wheel) that would warrant any more pay than you already receive?