I mean, it can be argued that games depreciating their value overtime is not a natural phenomenon set in stone, but rather a way to squeeze more sales out of the product once it stops being the latest, hypest thing, and everyone who really wanted it already has it.
If you accept that, then it is not hard to accept the opposite: a game that starts not being the hypest thing, and thus needs to start at a low price because nobody really wants it; but then becomes the hypest thing due to some unforeseen factor (in this case, getting a movie based on the game), and thus appreciates in value because people now really want it.
From that perspective, I honestly don't see an issue with it, it's just staying consistent with the rules that give us lower priced sales in the first place, this is just the rare situation in which it works the other way around.