Steam Sales used to destroy my wallet because there were so many good deals on games I didn't have. For the last few years though, I don't know if the deals have been worse or if I just don't need any more games.
I think the games have gotten worse. I can't find anything I'm excited to play :/
With "worse", I think I mean that the games are not particularly fun or innovative anymore. It all seems like the same as before, with better graphics.
Yeah currently there is very little reason to buy on sale. You aren't missing out. No more flash deals, no special pricing. Nothing to miss out on.
Every single game has a regular price, and a sale price. The sale price is the price it will be on sale - every sale throughout the year. If it's 10% for Halloween then it's gonna be 10% for Summer, Autumn, New Years, for years to come.
Just put everything on the wishlist and buy whatever you are going to play right between now and next sale.