A good example from me is an item I bought last year, it's not Star Wars related but gives an idea, I was looking for some Teenage Mutant Hero Turtles medals from 1990, they produced a set of 15 medals which could be displayed in a collectors folder. These medals are very common and easy to find, however still sealed in the clear packets is a whole different story, they're so rare and hard to find it's ridiculous, iv'e only ever seen one single ebay listing for sealed medals in the last 3 or 4 years.
There's was no previous sales history whatsoever for any sealed ones so the seller had nothing to go on, he listed a full complete sealed set of 15 for £40 and I nearly snapped his arm off ( over the internet
). The point is this seller had no idea just how desperate I really was to get hold of some of these mint & sealed, I was genuinely prepared to pay up to £30+ just for a single sealed medal if I seen it listed for sale.
These medals were a huge part of my childhood and they really meant a lot to me, the seller could have made a lot more money out of me if he wanted.