Might have something to do with ... ACTING! Blatantly fake titties are also kind of a turn off - they were great when no one knew there was such a thing as affordable fake titties!
Wait a sec .. I will now counter my own points with an Actress that could use both fake titties and the ability to act.
I think you are right. But exactly as a body can be modified, also acting can be helped. Don't you think? By the way, very nice pic.