Encryption is irrelevant when one party will give out the info for a price.
Google does not, nor have they ever, as far as I'm aware, sell personal user information to third parties. Google sells ads targeted at keywords and other interests, and while in an indirect way, this is profiting from user behavior, it is not the same as claiming they give out your personal info. Using third party hosted mail is a trade off, especially webmail. Unless you are using end-to-end encryption, intermediar…
Are there any references or details regarding this?