If that's true i don't think Japanese teenagers are your average stupid, they might be advanced stupid. Let's be honest, none of us were than dumb (ok maybe a few of you) enough for a someone to BLATANTLY show love to you and you fail to realize , doesn't that instinct kick in at some point? On the other hand i think Most westerners prefer the intelligent-sarcastic-villainous types because we are exactly that. If you check most Eastern cultures they aren't really as straightforward or as exposed to things we would pass of as normal, like calling someone by their first name or barging into someone's house because their mom can cook better than your's or even just walking up to a chick and saying you are interested right off the bat so having a VN character who wouldn't know the feelings of a dying cactus would well suit them.