Because they allow people to come in with their crap they bought from Amazon for returns. This morning I had to stand in a line of 7 women ahead of me returning clothes/shoes they bough from Amazon, and none of it boxed up. An example is one lady brought in 2 boxes of shoes she got from Amazon. What should have been free shipping back I guess ended up costing her $19 because UPS would not accept the way that she brought them back as they were just shoe boxes so they charged her $19 for 2 shipping boxes that were no bigger than the shoe boxes that the shoes were in. That whole process took almost 10 minutes from the time it started to the time she was done.
Then to stand in line for someone who was bringing back 6 items that had individual return shipping. On a weekday it is nothing to see a line of people like this going 100' outside of the door waiting to get in to return stuff to Amazon.