When you are on the Artifact Market or in the Theory Lab items that you already have the maximum amount of installed or in your storage should be identified as such. That way you don't have to go back and double check...hmm do I already have 3 or 4 of those... I know that in most cases the player knows this, however, it would be nice to have it confirmed while in the purchase window. Seems like an easy thing to do. I know I'd really like to see that. Thanks!