Hmmmm... Useful idea, but what if I want to sort via common, uncommon or rare? The sensor would have to be able to defer between these micro symbols lol. I know sometimes I miss-read the symbols when sorting. What happens when you want to sort via basic, stage-1 and stage-2 when the description is in differant places in differant series? The machine would have to have some sort of data-base to recognize between these differances. Definetly possible and would be a great purchase. I would definetly say this would be more expensive then $70 though being the technology it would require. I would market the item to sale towards all age groups for maximum sales though. Let us know how it goes!