First up Games, when I was thinking about writing this article I was seeing some PSP games on eBay going for over $200. But when I pointed out this fact on social media, it literally changed this entire article. With some games being in demand such as P3P, SNK 0 and others you will see sellers wanting over $200 per game, but as other collectors have sworn to me it is still possible to get those games on the cheap, and if you see a game like Imagine Champion Rider that you can not find a price for like your truly it does not mean that game is super rare. It just means it wasn't released in your area that game goes for $17 from what I have been told. So if your into collecting like me just keep your options open as you will never know what you might find and for what price.
UMD discs, on the other hand, I do know what is rare and I am being honest here it is the porn titles. Think about this, limited release, often being sold online or in shops that sold adult toys. There isn't many out there, and they are hard to find and can be expensive. To how many titles there are...your guess is as good as mine.