You need to do some investigative journalism. Sony has the same games in these sales over and over again.
While they might occasionally put a new game in there that's worth buying, the majority of the games are the same poorly made indie (or even big studio) garbage they've been trying to swindle people into buying for years.
If you're not familiar with Gibson B Pontes, look him up. They have had games like "I Am Bread" on there for years.
Rarely do they have anything worth purchasing. If there is something worth buying, you've probably bought it already.
It would be great if we could see deals on things like the DLC for the Resident Evil 4 remake, or Final Fantasy Pixel Remaster for a more appropriate price. Instead we get "Action Henk" on there endlessly.