I really like weird stuff in UO, and I know other people do too, but often the weird stuff I like really isn't particularly valuable. It can be hard for me to tell. Like, it can have personal value, like my V day card that says "You're my favorite, from Jesus" which cracks me up whenever I mouse over it. It is worth way more to me than the gold I paid for it, because it makes me laugh, and I'd never sell it for any amount.
Or it can be the book I bought for 50 mill that when you double click it gives sextant coordinates. Would anyone else have paid that much for a book like that? I really don't think so. But I thought it was awesome and really wanted it. Oh, and there's my no decay furniture I've collected over the years from old idoc falls. I decorated the grassy area of my castle with the stuff. I have chairs, tables, paintings, even checker and chess boards, all sorts of junk that won't decay. That might actually be of interest to other people, but I wouldn't sell my furny. It doesn't take up lockdowns! So nice!
The comm crystals I have are kinda low on my weird stuff list of interest, but even if no one ever wanted to buy them I would hold onto them because they don't exist like that anymore, and I really don't think there are *that* many around anymore. They're a (small) piece of history that I can't just throw away.