As in buyer's remorse this term also refers to the post purchase experience. In this case it would be when you rekindle the excitement of an old purchase, that you take for granted now, by talking about it to someone you haven't seen since you bought the item.
I hadn't seen Bob in six months. I can show him the latest iphone I bought a couple of months ago! He'll be envious and I'll get me some buyer's re-worth!