What is the percentage on?
It's important. I used to work for a local courier service that wanted to compete with UPS only using IC drivers instead of union guys. When I left, the rates on their main customer were 2.50 a box, and you got a percentage of that. In a good week, my huge Sprinter might make 850 a week. That was at about 50% commission. You can see that the rates were dirt cheap and even if they paid the driver 90% he would do well to stay in business long. HR department had to keep the bearings in the revolving door pretty well greased to prevent them from burning out.
The point of that is that it doesn't make a hill of beans of difference if they pay you a high rate on cheap freight.
I agree with Xiggi otherwise though. Consider the company has to keep lights on, pay office help, pay the lease on their office property and presumably make a profit, and you can see that 80% commission to the driver is not likely to happen. It does make for some great dreams though.