I've stopped buying games during sales. I find that I don't get around to playing them too often. I'd rather get a game full price when it's something I really want to play than waste money on cheap games I won't play at all.
Well I'm playing them all. Can't stop. The key is not buying expensive games that take weeks to beat, which you'll probably never finish. Just bought 2 more games, Mark of the Ninja Remastered and Sundered Eldritch Edition. Jenny Leclue and DarkSide Detective are on sale for the next 2 hours.
Also bought Little Nightmares and Child of Light.
And preorderes Metroid Dread special edition and the two amiibo's. Also have a Dark Samus amiibo. She is my Smash main!
And I bought 10 games I have not started during the previous sales. But it is alright I am methodically playing one game at the time