Tiers with the terms written out, cohorts that start on a date, a community that stays.

Dues, notice, guests: on every tier.
Cohorts start together and finish together.
Lessons, downloads and the members' room.
Guest passes on every tier, referrals rewarded.
The vocabulary and the first exercise.
Live sessions, replays the same night.
Your work reviewed in the room.
Present it, keep the community.