It's all in the eye of the beholder! What is junk to you might not be junk to me. I stopped at a yard sale I thought would be a wash out but I stopped anyway. She only had about a dozen things sitting on a picnic table. But I found a glass baking dish that became my favorite for many years so I don't always shrug off the sales that don't look like there is anything I would want. You never know when you might find something tucked away that is a terrific buy.
Here at least some people keep some things in the house and only put up a list on a paper what they have for sale that you have to go look at if you are interested. The rest is out on tables to browse.