This has happened to me, which is why I now have an entire section of a cupboard dedicated to parts and cables. I'm not entirely sure an ISA card would ever be needed today, but you never know!!!
Same. I have a shelf dedicated to old PC stuff because sometime I end up needing it. Maybe I haven't touched it for years but it comes in handy sometimes. For example I was asked to get some files off some floppy disks someone had a couple years ago and I was the only one they knew who was able to do it. There's also been quite a few instances of someone's PC going down and I was able to loan them something to get them going again until they bought a replacement. The way I keep from spilling over into full "hoarder" is that this shelf is the only place I allow myself to keep computer parts so if I get more stuff than will fit on the shelf something has to go to make room.