A classic economic view on an object being bought/sold is that the item has more worth to the buyer at that price than it does to the seller. That means that if you reverse the transaction the buyer isn't getting what he believed the item was worth back.

That's without going into any hassle associated with replacing it's use.

I'm not saying that people would be justified in being really upset but I'd certainly understand why they would be (especially for a niche product because that means it's harder or more expensive to replace)