If you sell everything on your table, then it's time and effort well spent.
I've never understood why some people will haul the same overpriced stuff from one meet to the next. Also don't understand the folks who refuse to negotiate, and those who sit there and sleep. In all of those cases, they're wasting their time and mine. I get it if someone wants to go and socialize, but you don't need to buy a table to do that.