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 have a feeling these are gonna go the way of beanie babies and vinyl toys and be worth very little in 3-5 years.
But then again, I just dug out some of my old Matchbox cars for my 6 year old. Just for fun went looking on eBay, and if I had treated them better, a couple were worth over $300. So who knows.
That’s fine, I don’t think he’ll ever sell it. It means more to him than a pay day.