There's plenty of one-cent auctions in the gaming category that are coming to an end with no bids as well- just not as easy to find since the price range there is bigger.
There's two things to keep in mind with movies versus games: they're notably more mainstream, and faster to consume. Think about it- you spend twoish hours watching a movie, and then it's over. It doesn't change if you watch it again, there's no secret scene that shows up if you press a button on the remote at 21:57 or anything like that. Unless you're a cinephile who likes to pour over every detail in a film, you're probably done after one or two viewings- why waste money & space on keeping around a physical object you're likely never use again?
Now, on the gaming side of things- you're a lot less likely to find a title you can 100% complete in two hours. A game can change when you play it again, there's secrets, there's collectibles, there's alternate story branches to be discovered- you can invest a lot more time into a game. Even if you do get 100% of everything, there's still an enjoyment in a game that isn't present for movies due to the interaction. You don't watch a game, you play a game- it's not passive. Look at all things we do- sports & cooking & crafts- all very repetitive by nature, but still loved becuase the action itself is rewarding. There is no action for movies, only observation- enough for some, but for most, once you've seen it, you're done.
What this means is, game media holds its value over movie media due to people interacting with it more. You're more likely to pay for the convenience of anytime access & to keep that access item around- which in turn lowers the amount on the secondhand market, resulting in higher prices for what's there. This added use also means games are more likely to get damaged, so over time there's less copies around to be sold.
While it is sad to see these things become so much trash, it's just the nature of the world- go ask some kids who Howdy Doody is & see who many know, and how many just laugh becuase you said hi to poop. Everything we cherish will be junk someday, best not to worry about it much.
Oh, and as far as Blu-ray vs. DVD? That's simple: it doesn't look better unless you pay for the right kind of TV. Most people didn't bother.