There’s always something you can do with any yarn. I might buy it thinking it would make a lovely thing to look at, and then enjoy making it become a scarf. Then I could admire the finished item rather than risk damaging it by wearing it.
I don’t think I’ve ever bought yarn without knowing what it could be, even if it never transforms into that.
It’s very difficult for a small wool yarn shop to be financially successful nowadays. It’s therefore very important to both have plenty of yarn at home for when you feel inspired to knit (or a small grandchild asks you to make a precisely defined something on a Friday night, true story, and you can’t wait for the post) and also to support small businesses, often ones run by women.
Is this in any way convincing? 😉