I had the chance to purchase a beautiful Topps 1952 Mantle back around 1980 (don't remember the exact year). But that card had hit a high of $3000 and then fallen back to around $1K, which is what it was offered to me at. I thought it wouldn't be climbing back up in value any time soon and there would be plenty of other opportunities, so I passed. The card quickly climbed back up to it's previous value and kept right on going.
