+1 on keeping tabs of hobby stuff on an Excel spreadsheet. I do the same with my spare parts, and a breakdown of which bike the parts had gone. Linking to a URL or jpeg of the item whenever I can.
It simplifies one's inventory when the memory is fading.

I've gathered some NOS Campy Centaur and Record stuff a few years ago. Some NOS lesser mainstream brands too. Only vintage NOS would be hubs (high flange Gnutti and Maillard), and a set of Superbe Pro wheels awaiting that future classic build. Most of my NOS purchases are only if they are deals too good to pass up. The rest of my "hoarding" is decent and good equipment that is being discarded by someone. I gather what I know I WILL use, or someone else could use. So far, it hasn't gotten out of hand.

I'm trying to nurture in my stepsons the same biking passion that I have. Then maybe this collection will be appreciated by someone in the future. So far, I haven't seen much depth in their interest. No surprise given this PlayStation, Nintendo generation.