If you were forever being told to keep your hand out of the cookie jar when you were younger, it might not just have been because your parents didn't want you to spoil your appetite by snacking. They may also have known that the cookie jars would one day go on to attract incredible prices online, and they didn't want you to damage them!
Cookie jars just aren't around as much as they used to be. If you have cookies in your home, you probably just eat them straight from the packaging. The idea of having a specific jar for them seems almost quaint. That means there's now a nostalgia market for them, where they're viewed as an old curiosity. You'll see the biggest bids on yours if it comes from the 1940s or 1950s - especially Uncle Mistletoe Marshall Fields cookie jars, which go for an average of $1,200 each. Jars in the shape of famous film or television characters are also frequently worth hundreds of dollars.