That's a good question, +Dimitris Andreou
. It seems hard to find out everything Google actually does with the information it collects on us... I haven't found out, anyway. And without knowing that, it's hard to answer your question.
However, since Google makes its money by knowing stuff about us, and I don't want to spend money simply because someone knows what I'll buy, I'd rather avoid Google knowing more about me than I choose to reveal by, e.g., typing information in comments like this.
For example: you make "boring ads" sounds like a bad
thing. For me boring ads are good
since I don't like ads, and it's easier to avoid paying attention to an ad if it's boring.