Another website I've used in the past is VGCollect and it has a nice feature to display your collection by platform. I think this would be interesting to see for both just raw number of games by platform but also value by platform using Price Charting data. Even if we couldn't get a chart, I think it'd be nice to be able to see the value of our collections by platform.

I like to be able to see at a glance if my items increase in value.

If they do, add a green up arrow,

if they stay the same, a yellow line,

and 

if the go down, a red down arrow.

Add the red target and purple target gba. Add the toys r us edition as well

Just a thought, because people argue this with me every day. It would be really great if there was a way to distinguish between a console only and a console with cables/controller.. or at least spell it out, so that people don't argue that a console only is loose -- most of the time, those basic accessories can cost more than the console to acquire.

The ability to auction your game off in the marketplace or have a day each month to to host an auction.

Average price works perfectly fine for most titles. But for rare games that get fewer sales each month-- e.x. boxed NES games, Neo Geo, TurboGrafx, certain SNES rpgs -- the sample size is so small that average isn't statistically valuable at that point since it could be influenced by one or two sales. Median isn't as susceptible to being skewed by extreme variations in price, so it would minimize the impact of those few outliers that sold for notably lower or higher than average.

Can you add the PEGI system for PAL Games, beacause in Europe, it's note the ESRB and not the same system we use for rating games

https://www.pricecharting.com/game/playstation/lunar-silver-star-story-complete

^ this version is the Collector's Edition Box Set (I own it and have checked the UPC on the back to confirm), but you have it labeled as the "standard" variant.

Meanwhile this one, https://www.pricecharting.com/game/playstation/lunar-silver-star-story-complete-4-disc , you have labeled as the Collector's Edition Box Set, which it is not. (I dont know where this other listing came from, even the UPC is wrong)

Both listings need Title Updates and their Ebay listings are all over the place and need correcting as well.

Allow to bulk edit things in the collection, having to check things for every game gets tiresome with a big collection.

Also allow to easily change a game version from NTSC to PAL or JAP, since when I imported my collection it was added as NTSC even tough most of them are PAL.