I think if a player wants more money because he "outplayed his contract", then pay him more if he hasn't been getting into trouble. But, put in a clause stating if he "under plays his contract" team able to reduce his pay accordingly. Injuries aside.
I recently met my good friend's dad. All I could think while shaking his hand was, “Gross, my friend came from this guy's balls.” I'm pretty sure it's thoughts like these that separate me from the general public.