Optimizing for the Right Thing (Yahoo and Ads)
diegobasch.com
diegobasch.com
Optimizing for revenue via delivering valuable clicks to your ad buyers seems more a right choice. That speaks of good placement and excellent targeting (better CTR) combined with an overall good experience (to attract/keep users in the first place).
Very very annoying, yet I've been tolerating it because there's very few alternatives when I want to play a simple 15 minute game with other people.