Not as handsome as you? You are just jealous of my unibrow and bosslike mustache...
No, I don't think ADs are experts. But since they aren't experts, why exactly does one feel the need to show off in front of someone, who is clueless and then feel good about it? It's no accomplishmet and will only have negative consequences, if any..
The only reason people do this, is to fool themselves. So they can say "Oh yeah buddy, that was a good buy, even the AD thought the watch was real.." Make no mistake, a rep is a rep and no matter how many people you fool, you still know what's up.