Gamestop certainly wouldn't pay enough for me to sell to them; I'd rather sell or give to a friend, or sell on a marketplace for somewhere between Gamestop's buy and sell prices. Most of the independent used game shops have tighter spreads as well.

This past year, I bought Animal Crossing for the Switch; even though I was pretty sure I wouldn't like it. As expected, I didn't like it, but I had a friend who wanted it, and I could mail it to them. That's a "lost sale" in video game accounting; but if it was tied to my switch, I would have never bought it, and my friend wasn't planning to buy it, but is thrilled to have it.

A book doesn't need to be intentionally made difficult to copy, because in its natural form, it's a lot of effort to copy. There's not enough money to be saved by copying a book to make it worthwhile, except for maybe textbooks.

Arcade manufacturers don't get a cut of the quarters put into a machine either (well, maybe they do for some of the games that now need an online connection to run).