Do you understand that few items made today will last 25 years, and that durability is one of the things that makes vintage guitars valuable? A guitar from the '90s is now considered vintage, and it's not just about how "good" it is compared to modern guitars.
Take a '59 Les Paul for example—it's not $10,000 because it's necessarily better in every way. It's $10,000 because it's rare and has historical significance. Vintage guitars represent a piece of history that can't be replicated, and that's what collectors and players are paying for.
I'm actually selling a vintage guitar right now, and it's hilarious how many people misunderstand this. They'll tell me they can get a new one for cheaper, as if I didn't already know that. Others argue about when the guitars "got good," but that totally misses the point—it's about rarity, craftsmanship, and the fact that guitars from this era have stood the test of time.