I like having a number of games I haven't played in my library. It helps for the slow months of gaming when I'm itching for something new to play. The digital download trend PC gaming has taken has changed the way I buy games now. Unless it's something I must play right away, I wait for new releases to come down in price a few months later and then I'll buy for a hefty discount. I tend to take my time getting to the games I paid next to nothing for.
Cities: Skylines is exactly what I've been looking for!