That makes sense. Paying with personal information was the statement that I was responding to. The personal information is worthless without the exposure to advertisements.
As far as I know, the reason they want my information is to make the actual revenue-generating thing work better. The advertisements would still make Google (far less, but still significant) money without my personal information. My personal information presumably wouldn't generate much significant revenue at all were it not being used in service of advertisements. That's why it seemed odd to me to say that I'm paying with my personal information, and not mention advertising exposures. Perhaps I'm quibbling though!
Anyway, I'm starting to feel like a modern jackass[1]; sorry if this wasn't very clear.
1. http://www.urbandictionary.com/define.php?term=modern%20jack...