Had the same thought a couple of days ago!
I totally agree with TOOOLD2BITE. Not that I would ever discard my means of personally keeping a record of all of my purchases, but this would alleviate having to have more than CS running. I think this is a much needed column for private viewing by the owner.
I also agree with an earlier post on having a cummulative total on your collection, which of course could include your total acquisition cost.
My one cent!
Happy collecting everyone.