True story... a few years ago at a local neighbourhood garage sale, I picked up a 5cm micro Nikkor. There was no price on it, so I asked the woman the price. She said, "Oh, I guess $1.00". I bought it, not having a Nikon but having a best friend who did. When he next came down from Brampton to visit, I gave it to him.... what the heck did I need with it.
A few months later I was talking to David on the phone, prior to going to Brampton for a visit. He told me he had $100US to give me. Whaaa??? "I'll tell you when you get here."
He had researched the lens, and discovered that only 2000 had been made. It wasn't in mint condition (someone had blacked out the lettering on the front trim ring; David did his best to remove that without damaging anything), so it didn't go for full price ... but he had sold it on eBay for $1200CDN! If it had been mint, he probably would have gotten $1700US.
He keeps asking me "When is that garage sale?" I say, "I dunno", cuz I sure as hell aren't taking him ... any new finds are MINE!!!