From what I have read and seen on the news, retail theft often impacts drug stores, Ulta Beauty, and other places not taken for their personal use. The people doing the theft are working or being paid to steal particular items. The stolen merchandise is consolidated and then sold at flea markets, the open lots you describe, or online. There was a recent situation where a lady had something like 20 or 30 people working for her to steal makeup from Ulta stores, and she then resold the items via a nice Amazon store.
Soap, toothpaste, and personal care items are popular for theft because they are items people need and will buy.