I'm sure your mileage does vary, but in every company I've worked for 90% of revenue was already going to employee salary. At that point, raises are not an option because the employees are not bringing in enough money to pay themselves more. So, the challenge becomes how to raise general workplace happiness with a small amount of revenue set aside from salary, bills, taxes, ect... Thus, potato chips. Even (the occasional) sweet macbook is cheap compared to a full month of paychecks.
The only thing that amazes me is that more workplaces don't do this (refresh the macbook of all staff with an updated high end model every time a new one is out).
