Then the editor will generate both an "average number of hours" indicator and a "replayability multiplier", and you'll be entitled to a refund based on the number of hours you played since you bought it.
If you destroy my property, you should pay to replace it. If it is no longer available then the lowest valid amount I can think of would be the purchase price.
Unless you want to argue that an official working copy on this game (now unique) would be worth less than the original steam price.
Also if you went to the cinema and watched 90% of a film before the management turfed every one out. Do you think a 10% refund would make it right?
So you're saying if the average number of times a Friends collection DVD is watched is approximately 1, nobody is entitled to watch it more often, even if they're a superfan?