The only people this benefits are the poor employees. I have some natural advantages over the next guy, namely that I can carry about 140 lbs of equipment, while a lot of the guys I've worked with can only carry probably 70-80 lbs. Basically I spend half the time with the petty crap and end up finishing the job sooner. I don't believe I should be getting paid the same as the next guy, I also don't think I should be paid as much as a guy who can carry 200 lbs and can get things done faster than me.
If someone does 20% more than me, they should be paid 20% more. I don't believe in pay brackets and crap like what Unions use, because I've seen what unions do to people. I knew a guy who'd been in a dry waller's union for 20 years, he hadn't had a single pay rise since he got put into a foreman role, and he'd seen a lot of guys his age be canned because their wage was ridiculously high and they were too old to do the heavy lifting.