I have friends that will sell my bikes for my widow, if they don't buy them for themselves. I've never been opposed to having an extra of anything, especially Campagnolo. Keeping a spreadsheet seems a bit dehumanizing to me, and values change. This is especially true for older steel, which is what I believe most of the bikes on this forum are.

I do take lots of detailed pictures for insurance purposes. A picture of a fresh build is always a good reference point.

Breaking everything down into a spreadsheet reminds me more of Scrooge McDuck than Dave Stoller. I like Dave Stoller better.