This could be something that you bought for a higher price than what most people would guess based on the item, or it could be something you bought for a normal price that has gained significant value as time has gone on.
What made me think of this question is a LEGO minifigure I got with my “The Hobbit: An Unexpected Journey” disc. It is Bilbo Baggins in a blue coat that was apparently only sold in that movie box only at Target stores. Even considering the exclusivity, I would have guessed maybe $10-20 for such a tiny piece of plastic, but there are sold listings on eBay from $80 to $225. I could possibly even get towards the higher end of that number since I still have everything in the original box in good condition. It’s not worth a ton compared to some other items people may own, but I think most people would not expect nearly that amount.
I had a friend over who complimented my teapot, I love it because it’s a nice color, good size and has a stainless steel infuser that fits inside. So I offered to get her one of her own only to find out that this particular color is highly collectible and worth 6-7x what I paid for it originally. Now I have a nice teapot I’m paranoid about anything happening to, haha.
If you never intend to sell it then value doesn’t really matter. It can be a fun story when someone is over for tea, but you aren’t losing anything if something happens.