Include pricing and such for DC comic cards. I've got a few sets outside of the Marvel ones, I'm sure others do as well.

add all union arena sets to the site

A Bleach Thousand Year War Union Arena cards to the site

Add the Topps Star Wars cards to the site.

Track the value of LEGO minifigs like you do for sets.  Lots of people collect minifigs only.

The the graded population for cards in the app.  This data is available on the website, but not the app.

This would be nice to have, especially if sharing the list with someone else. Also a nice alternative to copy and pasting it to google docs…

Press a button and it picks a random item out of your collection to play. 

Issue: Data users have bothered to input into their collection is useful and the inability to export this is a significant frustration, especially if wishing to use price charting as their main database. 

Solution: Adjust the export query to include all fields that are captured in the input screen of an item in the collection. Given the fields are already present in the data base of the items this can't be a significant change to the query.