Is this a regional thing? Ocean air or something?

Everyone comments about checking the status of these parts when buying an old bike. In my experience I've only run across a stuck stem, but it was easily freed with some PB blaster. And I've had to muscle out a couple of tight seatposts, but never had to cut anything out.

And I buy old wrecks of bikes. Bike boom era stuff mainly, so they're 40 years old. I really don't anticipate stuck components when I buy these vintage beasts.

Whats your experience?