With a few exceptions, pretty much all of them are games i buy at some sale or at recommendation of someone i trust but i find time for actually playing them much later. Many of those games (e.g. VtMB that i mentioned elsewhere) are games i've bought (let alone played) way after their developers ceased to exist.
You probably need to check out the whole "gaming backlog" meme :-P
> What percentage of your games do you play more than a year after purchase?
Admittedly a very low percentage.
I will say that I definitely spend more than 90% of my time playing games on games that I've bought more than 10 years ago.
To me, games are a way to experience a different life in a different universe that is full with other friends and acquaintances. They are fun worlds that I can visit whenever I want.
That's why stadia (and games that require online connections) are things I can never see myself accepting.
If you approach games this way there are much better deals than Stadia. Microsoft's Game Pass and Sony's PS+ both get you free games for roughly $60 a year (so if you get one full price game out of it you're "breaking even"). They're cheap, but ephemeral (you lose the games when you unsubscribe). Stadia seems expensive and also ephemeral—not the best combo.
If you could have rented most of your games at a lower price, and then bought the ones you really liked on sale, would you have paid more money total?