How do I get more people to look at my cards at a show

[SetBuildingGuy]

I set up at a couple of shows the last month. I have 10 cent boxes filled with stars, inserts, and chrome cards. I have 25 cent boxes with more valuable stars etc. and i have dollar boxes. Everyone that looks at my cards were happy and said these were good deals. My question is how do i get more people to stop and look through the boxes? Any ideas? Is this a case of having to build up a customer base? I made 150-200 a show less the 40$ for the table which is ok. Just looking to increase sales.