if i know I'm going to get $40/hr or $1600/week whether I bust my hump or just make it look like i am, what am i going to choose?
if I know that I need some extra money for something, and the only way I'm going to get it is working overtime, what's my incentive to get the job done quickly?
I guess, because I was raised by a contractor, I've never liked the idea of working for a fixed hourly rate. I've never liked the idea of knowing that I am going to only make $X this week, no matter what.
Let me get rewarded, or punished, due to my efforts. If I thrive, reward me. If I slack, reward someone else. Simple as that.