Actually, I can say that google company ,so far,doesnot really earn money .
However, in the near future, you "must" pay a lot on the product it will provide.
For example, the scholar google, map google, and the "ebook google".
Ebook google is what I will have to pay for ,I guess. Google company pay pretty much money on scanning all the books in national lab(USA ofcourse). This information can be searched on the net.