Living World season 2 question
These episodes are not being removed. This is permanent content. You can only play them at level 80 no matter when you buy them.
Whether they’re worth playing or not depends on the player. I enjoy story in general and while this isn’t Shakespeare it gives me a context for what I’m doing and what’s going on generally. I like that.
I don’t think it’s worth it for the rewards unless you happen to be an achievement point hunter.
Lastly, are any of them worth playing and what do you get out of them when you complete them?
There is a way to play them without buying, all you need to do is get a friend who has the episodes and have them invite you into there party and replay those episodes. Although doing this would mean you won’t get the achievements.
Nor the rewards.
As noted above, you can play them with a friend, just to experience the story (or watch them on YouTube), but to access the Achievements and/or rewards, you would need to purchase them. Once purchased, they are unlocked forever for any of your L80 characters.
Good luck.