I’d like to sell my games straight from my collection instead of going over to the sell part of the website. I like seeing all my inventory in front of me rather than leaving it and looking back over and over 

I have a lot of Sealed promo cards that I'd like to record in My Collection properly, currently I have to put them in as "Ungraded" - which although not strictly wrong, it's not an accurate representation of the promo card as they are worth more when still sealed (usually). 

Under your settings, you should have an option to turn off the "You've visited X days in a row" message at the bottom of the home page.  Some people may not like seeing how many times they've visited the site.  

If possible you should add a ’Like new’’ option. Games that are like new should not be priced the same as scratched up games with a wrinkled manual, this might be difficult to get data on for you guys. I would just really like that option because the value of my collection is a lot higher than what shows.

I record the actual item code for all my manuals, cartridges, boxes, and other inserts.  Some examples of SNES cartridges, manuals, boxes, include:

There are various box, manual, and cartridge variants which I would like to track and the way to do that is via the Serial Codes.  Please include on the importer and exporter.

I have a massive spreadsheet with the cost of each item which I would like to automatically import when importing bulk items.  It's painstaking to have to go in and manually enter the cost of each and every item after a bulk import.

I would like to see a feature similar to a Wishlist, but it would be more of an avoid list. I use pricecharting to keep track of my collection (it's very large). Recently, I've begun to replay (or play) my whole collection and get rid of games I do not like enough to keep. I would love an option to check off or avoid a game so that I do not buy it again in the future. Some games look or sound way cooler than they are. I'd like to have a way to prevent Mr from repurchasing games. A list to help me keep track of games I've played, don't like, and never want to purchase (or repurchase accidentally). Right now I need to use a different app for this.

Nowadays we see more Consoles and their variations being added in the lists, but they are all marked as 'Videogames' in the category list. I hope its possible to add a new category 'Consoles' so we can look them up more separately. There are still a lot of variants of Consoles missing, but they are being sold on ebay/amazon/etc. I often wander what they are actually worth and hope we can see that here in the near future.

Retro brawlers, 8bitdo, retrobit, & hyperkin are all pretty reputable for the most part. Intec gaming is kindve underground. Also being able to catalog clone consoles would be cool too.

I think it would be so convenient if Video Game Price Charting added retro brawlers controllers to the database, along with various wireless controllers for older consoles that didn’t originally include wireless. Examples are 8bitdo sn30, retrobit tribute64, hyperkin admiral, intec gaming wireless Bluetooth receivers for various retro consoles. 

When you sell an item, it is no longer in your collection as you have sold it. I think it should automatically be removed.