This thread is a good callout. I've been watching the griffey surge in particular recently - even went through my 90s box this week and pulled out some griffey cards that were worth putting in my PC box now. Then last night I saw a thread of someone looking for 90s inserts/parallels and I thought to myself, no way.
For me, I've always hated negotiating with people, so trading by BV let's me avoid that. But I also only trade for set needs or Delgado cards (and it's rare I find someone with a Delgado card I need anymore). So not usually high value stuff. There's been a few times I kept a card because I saw it sold for much more than BV, and one time I let someone know a Delgado card they had sold for above book, but typically I think I'm not really affected by this. Other than sometimes I end up needing the cards for sets that sell for far above BV and I'll have to just buy them at some point lol. But I don't wanna see other people get taken advantage of!