Cast iron seems to be having a moment just now. I’ve seen collectors on Reddit that have dozens of pans. Some have hundreds!
There are collectible skillets going for hundreds of dollars - watch for Indian Head brand but be aware that cheap fakes are a thing. I find the idea of faking a cast iron skillet absurd but here we are.
What’s kind of fun is the electrolysis rigs that hard core collectors set ip to bring back particularly grungy/rusty examples. A car battery charger, a plastic trash can and some washing soda and you’re good to go! All sorts of grinding/polishing schemes too.
Hot ticket for seasoning appears to be doing it outdoors. It can be done in an oven but it generally sets off the smoke detectors. 