(1) Why? Ads are charged per click/impression, not per sale. (2) How would you feasibly create a link between every brand who advertises with you and every bra

(1) Why? Ads are charged per click/impression, not per sale. (2) How would you feasibly create a link between every brand who advertises with you and every brand whose site you're trying to uprank? What happens when two different brands who advertise with you appear in the same results? (3) Most importantly, is there any proof at all that Google is upranking organic links on behalf of brands who advertise with them? (I don't think there is.)