No, no, a thousand times, no!
What you are saying is "all casual players should be able to be free-2-play and get all casual content" because they don't play very often? No way. If you want access to everything, subscribe.
No, I'm saying consider offering the option to purchase any content you're interested in experiencing, same as Section-X, with a time delay for new content for preferred players and even greater for free players.