I think that I have an affinity for junk. I'm not like a hoarder or anything, I just like to see what some people are willing to throw away but at the same time attach a price tag to it. It's the same concept of antiques.
I love flea markets. I like the people that go to them. I like the interactions between the people there. I even like the guy with booth that isn't selling anything other than his chance to preach that the country is falling in on it's self with any sort of change. It's all part of the experience.
I wander about in a precise manner. I make sure I get to every booth and try to glance at everything. This isn't like Wal-Mart. At Wal-Mart if you need an oil filter for a 2000 F-250 you know you need to head to the automotive section. At the flea market you might find that oil filter in a box of Barbie Doll parts labeled as Aristocrat Vodka. My point being that you have to thorough with your scanning.
You'll find some gems out there and might even make a friend or two. A smile and some conversation goes a long way. The more of that you do the lower prices become. Being rude or insulting might double the price.