As an avid PC big box/small box collector, it would be immensely helpful to download and see all PC & MS-DOS games/prices/release dates in the spreadsheet export so that I can keep better inventory (using pivot tables and whatnot) of my current collection and ensure I'm using standard names for all games in my personal spreadsheets.  

Add some plug n play coleco tellstar stuff and other things from the first generation.

I would love it if you started tracking direct from Nintendo Refurbished models.  They come sealed from Nintendo and can be sold sealed which is a major plus.  

Preorder bonuses are oftentimes included in used game sales to increase the value. Example: Fire Emblem Fates Special Edition with the three character keychains. Some websites such as IGN and Nintendo Everything include pre order bonus guides for yet-to-be released games. Gamepreorders.com seems inconsistent with which games get articles. Perhaps preorder bonuses could be included in the Details section of a game page. Including preorder bonus as a check box for adding games to a collection would be excellent, but I acknowledge a bigger change

Id like to see the current value of the games in my wishlist, so you can more easily determine what the cheapest item in your wishlist is. 

Would love to see the value of my Digimon cards. 

Include the model numbers in download files.

Please add this game thanks