Banks do gave detailed descriptions of your purchasing activities to the federal government. However, Google does not sell data to advertising agencies because they are an advertising agency. In other words when you give information to Google they user it internally. OMG, the horror.

As to bundelling up information and selling it in bulk they also just give it away. Where to do think the search suggestions come from? That's correct it's excerpts from everything anyone has ever typed into Google, yet people don't complain about it.