These are some great observations on the variety of expo experiences that you can't get from online discussions and transactions.
Interesting that the first bullet and the last one seem to be at opposite ends of the 'trustworthiness' spectrum -- the first seems like an honest vendor who is there to spread good vibes and make positive waves, and the last looks a lot like someone trying to slip something by a buyer (responding to reluctance over snap decisionmaking with a price drop is sketchy). And that second point is something that I probably do when I'm behind the table more than I realize -- I get all excited about Black Milks (mentioned earlier), since they're the coolest snake that I feel comfortable selling to a keeper of any skill level.