there's a record shop here that stocks mostly OK used vinyl in the $5-20 range but also has a dozen bins down below the racks filled with $1 albums and 12" singles. the guy who runs the store will let the $1 stock sit there for a couple of months and then literally toss everything unsold into the dumpster. he then restocks the bins with new $1 stuff that's come in lately.
in his mind, he's given it a go but it's such junk that it's not worth taking up floor space for more than a few months. considering that he probably sells a few hundred for $1 and paid only 5-10 cents per record, it's not a bad source of revenue to supplement his main record sales.
this will tell you how much junk wax there is: the owner has an ongoing problem where people will drop off a record collection (could be 50-1,000+ records) they want to sell. since it takes a day or two for the buyer to review them, the seller has to leave them at the store. after a few days, buyer calls the person and makes a cash offer (or says the store doesn't want most/any of them), and the offer is so low that the seller doesn't even want to bother coming back and taking the records back. sellers will sometimes just think screw it, too much of a hassle to go back to the store, load them up and search for another store, or put them out for trash. they just say "ok, great, I'll be in this afternoon" and then are never seen or heard from again.