It absolutely does have an affect on the bottom line. How much do you think it costs to feed an employee for a year? On top of the gourmet cafes, don't forget that an employee is never 50 from food throughout the day. Now multiply by the 25,000 employees. You'll get a number that is very big even for a company of Google's size.
Interestingly, if you say this in a "oh noes, my spam ads got pulled from Google and they won't talk to me on the phone!" thread, you get downmodded to oblivion.
You're missing the point. Google has this manual monotonous task of scanning millions of books, so they choose the company that offers the most cost effective workforce, paychecks and launch breaks are taken care of by the contractor Google hires as they don't pay those workers directly.