It wold be great to add the option, without the price being charted, to allow users to have all of their collection based in one website. This way, I can put in that I have a Retron, a Tiger handheld game, or a Tele-Games Pong system without having to have a separate checklist. 

is there a reason for this? or is it possibly listed under something else

Please don't accept BEST OFFER PRICES into your equation. It's not accurately depicting the prices of games. Best offer only shows the asking price not the lower accepted price. If it's $199.99 or best offer and it sells for $150 it'll show up at $199.99 on eBay and PC. Not $150. I say if it's a best offer on the sale to not include those please.  I like using PC but that is screwing the prices up. Same with cib listings many times falling into the loose category again making loose games higher then they should. Many game stores locally in my area use PC as a pricing tool and even they are thinking about not anymore bc of the complaints from customers.  Anyways food for thought. It's a great webpage and tool for collectors and store owners but this would help with making it more accurate. 

It would be really nice to be able to change the pictures of a collection item without needing to recreate it. 

A way to keep track of strategy guides, manga books  

You have all of the Skylander figures up to and including SuperChargers, but no Imaginators. I would like to see Imaginator figures added to the Skylander characters lists.

It would be nice to be able to add the price of the console and accessories into the collection, especially when looking at selling as a lot

There is currently no value difference between different releases of playstation games while on the market there can be a substantial difference. It would be helpful if the different releases of games were accounted for in the price options.