Yeah, you gotta say hi and network. For sure. I mean, especially because of the internet now, even if the customer that comes by your table doesn't want anything right then and there, they might later, or they might have 15 friends that want something. And if you make that personal contact and that connection with the fellow herper, it can only help for future sales.
Hey, you're ALREADY at the show, might as well make the most of it by getting your name and personality out there!
Good posts spidergecko and Bartman.