Would you consider adding a setting for "Proxy" on the Condition tab?
As a casual player, part of a casual group, we decided to purchase a few hundred of the all time greats to make a cube out of, and I would like to catalog those, but have no way to do that I can find. An added plus to that would be for their value to show up as "null" or "DNP", or some such, so as not to spoil the collection valuation feature...
(feel free to PM me if this is a private topic) Thanks so much!

I also have been wanting this for a long time. I have many proxies of high-value cards that artificially inflate my inventory and it would be great if they didn't. I've been thinking about this for a while, and despite a lot of people asking, it is unlikely to come to fruition.

As a an unsolicited suggestion, here's what I do. In my decklist I will select the Edition on the right side as Custom, then make everything "blank" except for condition which I make Poor. Then I'll add a Public Note/Tag #proxy. This way, I know I have a quality proxy in the deck, but it's not artificially inflating my inventory valuation. Just a suggestion.