Yeah, but if individuals enter into a contract where the license gets sold, Valve would have to abide by it and allow the 2nd party to download the game. If not, they’d probably be sued. At least, that’s how I understand it. Probably easier if they create a used digital game store and just tack on some sort of shitty “processing” fee to make it simple for everyone.
In 10 years, when $35k is the new $25k, sure