Yeah, I've seen the reality TV shows where they auction these things off, even the cherry-picked units for TV are like 1/2 absolute junk that literally goes strait into a dumpster.
Sure, but that's a somewhat self-selecting group of units -- ones that the renters let fall behind and get auctioned off.
In fact that is one solution to the junk problem sometimes recommended: if you are not sure put something in a storage unit, pay rent for a year. Anything you haven't gone back for in a years must not be important so let them clean it out for you. In theory you could clean it our yourself for more value (craigslist/ebay), but you run the risk of trying to justify keeping something.