a cross-employee policy affects all employees. however it affects them individually. selfish people (and there are enough of them) will only see the benefit once; and to themselves. Everyone might agree that this policy would be a good one; but every person only "feels" it once. The magnitude of the policy affects a larger scale than it personally "feels" like it does. So it would be a hard sell.

having said that - Ford (I think) decided that he wanted his employees to be able to buy his cars. so pushed the wages up and the car prices more affordable.