I dislike throwing things away. It’s a good thing that I’ve moved so much in the recent past (6 times in 12 years), or else I’d have a lot more stuff of questionable utility.
This phenomenon is called the endowment effect, and it describes how something becomes more valuable to us simply because it belongs to us (or because we imagine it belongs to us). Incidentally, the endowment effect extends to non-physical things, for example, wanting to click on every link shared in your social media.
If this topic intrigues you, read Why we love to hoard… and how you can overcome it.
(And, yes, I’m aware of the irony that I just offered you a link to click on 🙂 )