Are you a hoarder? Have a small pathway through your house? But you know where everything is, right? [emoji23]
I hate having extra parts hanging around, so I would say to grab anything that you find is in better shape than a part you have, or any part that is an upgrade to something on your rig.
I don't know about a "stockpile", but it wouldn't hurt to have a couple spare OEM CV axles- with boots in good shape- on the shelf.
There are some items that could be worth grabbing to resell, but there's really no reason to have a stockpile of '99+ center consoles.
My '01 hasn't really had any issues at all, and when things break, they aren't things I would want to replace with equally-old used items.
"Hey, my power antenna quit working after 200k miles, I think I'll replace it with a working unit from another rig. Don't mind the fact it has 236k miles on it." [emoji23]*