Ability to add a sold price to card and move it to a sold collection. Would be nice to be able to add a "sold price" to a card and have it moved to a sold collection. Like how it's done on Cardbase. I would like to be able to track cards sold outside of the website and remove them from my current collection. 

Saw this comment from two years ago. This would be an awsome idea. Just wanted to bring this up again. Would bring the site to new levels