Strategy guides are few and far between now unless it's AAA, but having older ones along with a few of the newer ones come out would be nice. Would just love to be able to keep track of them like my games. 

There is a listing for ''Buzz! Quiz World four controllers bundle'' but not for ''Buzz! Quiz TV'' bundle

It's very difficult to track the value of the recalled disc because they are lumped together. The UPCs night be the same but the cover art is clearly different. The US flag version was recalled after 9/11.

You should add a price between feature in the collection part.  Sometimes I like to see how many games I have that are $20 and up, or between $20-$50 and would be cool to just click a couple things instead of having to scroll and count.  

I usually use a mobile Web version of the site so if this is already a feature through a different source please disregard.

Every so often I'd like to make a donation, but I don't see any options available. If PriceCharting just put a bitcoin wallet address in the webpage footer, I could send a few dollars whenever I wanted.  It's simple and I wouldn't need to log into a PayPal account or purchase anything. 

my collection view, add check box for each item on the main view and allow me to sell the batch

Completed listings are usually within about a $2-5 margin of error from my experience between this site and EBAY. Often it will be larger if the listing exemplified is a month or two out of date (which seldom occurs, but does, and can throw off the perceived valuation.

Linking to TRENDING values would help to minimize that margin of error :)