Companies don't offer perks out of the kindness of their hearts, they do so as an investment out of which they expect a greater return.

The cost of things like "free food" is usually paid for with lower salaries, longer work hours or cuts to benefits. In other words, if the value of a perk is n, then the company offering that perk is extracting a greater than n value from their employees elsewhere, without compensation, or else passing the cost on to customers, or both.

TANSTAAFL.