Reminds me: the wife got me a Lego set for Christmas. I opened it and thought, "Huh? Whatever...."
Then a few weeks later, while the set sat in the closet, she asks me if I happened to look at the going rate for that set. I hadn't. Turns out it is discontinued, and it's going for $350-$400 right now, but the price has been steadily going up. And she actually bought two of them over a year ago, for about $70 apiece. She does stuff like that. She's got another set that is worth well over a grand right now.