How do you measure what a game is worth?

[LegitHyperbole]

Also, very few games are worth 90 euro, Sekiro, Elden Ring, Divinity OS2 yes but definitely not Mario Kart when you can get CTR on sale for 10 easy.

If I had to, I'd spend about 500 euro on The Witcher 3 before I started to question why, probably I'd talk myself into a few hundred more but def not exceeding a 1000.