I still wonder what would have made someone purchase some inanimate stones as pet. When I first read this on Quora, I thought it was a lie, so I had to check on it on Wikipedia. Well, some people have weirder taste than I do.
Rocks are something else, I love to see rare kinds of rocks mounted in public places, we have a few in my hometown but unfortunately I don't have a single photo in my phone right now. Some people are so persuasive in marketing that they can sell you your fingers and you will pay smiling.
What makes you, or anyone, purchase the things they do?
Somehow we believe (or someone makes us believe) that what we buy is necessary. We believe it will solve some sort of problems, or make us happier.
Do you choose your beliefs wisely? Does anyone? Some of them may not be serving us so well :-)