This is funny until someone you love dies and the pile of cards they gave you throughout your life is one of the things that makes you feel closest to them.
You know, I was once a small child that needed my mother's care. And she enjoyed giving cards for every occasion. So yes I did get some valentines day cards from her.
I kept the wedding invitation card from my step brother and my now step sister in law for several years.
It was just a folded piece of regular cardboard with a picture of them and a standard invitation message and I see them once a year, if even that often 😄
The only cards that are worth something to me are the ones with personal messages in them. If it's just your signature, it's going in the trash tomorrow.
I buy the bulk pack of general purpose gift cards. Some have got flowers on the front. Others say Happy Birthday in gender neutral styling. They're all blank on the inside. I write messages to people. The pack of 20 cards costs about the same as two of those shitty pre-written gift cards.
Some people don't attach value or sentimentality to $5 valentine's day cards and would rather just spend time with their partner and spending time picking out a good card for each other can be fun. I personally like the funny ones so it can be fun to pick those out, show them to your partner, have a laugh together, and then put them back. The card brings the same amount of joy, but you don't have to spend money or throw it away later.