I just went through a box of cards I’d gotten roughly the last two years. I initially planned to save a few key ones then toss the rest since I’m on this very serious quest to de-clutter. However I find cards very sentimental unlike other objects. About a third in I changed my mind, got rid of some but relocated them somewhere to save.
The rationale with why I consider cards received a memento worth keeping is I really value the effort they represent. To send a card you have to spend the time to write it, address it then put on a stamp. In general it’s becoming more and more a world where people are selfish. I therefore consider it a touching thing that someone took the time to think of me and send me a card.
I encourage you to send someone a just because card this week!