Metafandom

I always find it strange that Metafandom spoiler cuts for shows that are long over, like Firefly and Buffy. I am not sure, but it seem like at this point that we're long out of spoiler territory for shows that have been over for years. Surely everyone who is going to see them has seen them? Or probably doesn't care. I understand the point of not spoiling things, but at a certain point surely they're out in the public realm and you give up on keeping yourself pure and virginal. And isn't anyone who reads metafandom contractually obliged to have seen Buffy in its entirety about 5 times?

Mind you, I am not someone who cares really about spoilers as I find that if something is fun I don't mind knowing how it turns out. And in some cases steeling yourself for the ending is good.