Well i suppose theres not really one answer to this as every guy is different. But speaking personally I prefer it when my girlfriend makes alot of noise. It shows that shes enjoying it (unless you'er good a faknig it of course). Again this will differ between men but the louder and more vocal my girlfriend is the more i enjoy it and sometimes it even speeds the process up.
answer: if women fake an orgasm sound to boost someones ego then maybe their the ones who are really insecure. the fact that they think they need to that to lift their own self esteem is really sad. in my experience i haven't heard one yell all that much; in fact its me that makes more noise,but that's fine with me as long as I'm having fun. if they feel the need to do it for ulterior motives then that's their problem.