Please add pricing for japanese gamecube games. There aren't that many so I hope this will be one of the easier ones to add. 

Include price guides for all strategy guides, accessories, systems & collectibles and SO MUCH MORE but especially the Limited Edition versions of this stuff but also you have to include all of the normal versions and any other special versions as well and Promotional items and events are also extremely important ...I realize that seems like a LOT but I know without a shadow of a doubt that it can be done...I have been an extreme collector of many different and sometimes completely   opposite collections over the years and I still have each collection and the one thing that I want more than anything and I will guarantee that I am speaking for 90% of all other serious collectors as well is price guides for my collections...please trust me when I tell you that it will DEFINITELY be worth it and you will make a BEYOND EXCELLENT profit....thank you for reading my long message but hopefully it got the point across...there is one known Fact when it comes to collecting items and that is that Collectors DESPERATELY need accurate, high quality, descriptive, reliable and most importantly thorough and extremely detailed, knowledgeable and as complete as humanly possible with every known item included in the price guide...I will put it this way...if you had these price guides right now and they exceeded my expectations I could easily spend A LOT of money right now, like thousands of dollars, without a moment of hesitation especially if you could get them published into magazines and books 

Lots of "homebrew" developers have given older consoles an afterlife by developing and releasing games through web sites such as AtariAge.com long after the platform was officially withdrawn from the market.  I would love to be able to add my homebrew collection to my pricecharting profile.  While these releases are more difficult to track, that makes it all the more important and useful to have them registered with Pricecharting.

Upload the tracking number directly into the marketplace so it is stored for both buyer and seller. Automatically email the buyer with the tracking number too.

This makes it easier for both users

I have some cards from Halo of Awakening set that I’d like to add but there isn’t even a Battle Spirits or Battle Spirits Saga category option.

Like the new coin price guides and trackers, how about Vinyl records next? (Probably starting with VGM based ones and working backward to other genres of music)

Being able to prioritize which games, systems, accessories to acquire first based on desirability would greatly improve efficiency of purchasing efforts.

The report functionality doesn’t work for reporting Heritage sales. I’ve found multiple instances were Heritage sales were incorrectly categorized, under the wrong game variant, etc. with no way of reporting it.