I have absolutely no willpower to resist buying these, even though I never have time to play them. I buy them for the fantasy that some day I'll have free time for games again and can spend it all playing good games.
It's the same reason I've bought 50 games on GOG.com so far, and actually only found time to play 2-3 for short periods. The price per purchase (even when purchasing multiple on a weekend deal) is low enough to not make me feel guilty, and I get something to look forward to.