Certain things look nicer on a shelf than they really are. Airpods for instance. I had a pair of wireless earbuds and when they work properly they are okay. But if I bought Airpods I would definitely regret the purchase, as its really f**king expensive and I see not qualitative difference between them and wired earbuds.
But there are many books I have in my closet that I don't plan on re-reading and even that I don't really care for. But I did recently purchase the complete series of Bones at a discount book store only to find out that the Amazon price at the time was cheaper, so you could say I regretted that purchase.