Sett...
I am a young man, but I've worked retail in a few high-populous places here in Miami: grocery stores, fast food (not eally retail) and Apple (the past few years since iPods have been NUTS). Some of the customers really DO make for terrible experiences. It does certainly help if you are a bit of an extrovert, though.
I go to shows to become more educated, not necessarily in terms of history, etc (though I value that as well), but more so because buying a gun/knife for carry is a very personal thing. I want to be able to feel and grasp what I'm thinking of purchasing. I may not buy it from a deal at a show, but I just might if the price is within reason (based on what I can find it for online, if it's something that is so beautiful/striking (in terms of customs) that I can't pass it up, or if I'm just blown away by the customer service.
Here in Miami there aren't too many places to get your hands on a Busse or Fehrman. Those are expensive knives, and I'm not comfortable shelling out the funds without first at least seeing how it feels to me. For me, a show can be a very informative experience. I think if people go into the experience with open eyes and clear expectations, it will be good, regardless of the humps you meet while there.
J