"What is the one thing that they charge for, except advertising, and that scores of people care to pay for? Nothing." I think you forgot Google's enterprise to

"What is the one thing that they charge for, except advertising, and that scores of people care to pay for? Nothing." I think you forgot Google's enterprise tools (i.e. Google mail, docs et all with an actual helpdesk to call to). People do pay for those. But I have no idea how many customers they have.