Here's another thought - it may just be your location. I know you're next to the door and people see your items as soon as they walk in and that's great. HOWEVER, a lot of people (me included) will say to themselves "Well, I'll hit that stand on the way out since I don't want to spend all my money right away" and then spend their money further down the line.
I'm glad you made a least one sale and hopefully tomorrow will bring more $$! :D :D