I just got a ticket this morning so keep refreshing! Was also expecting higher tiers to receive a refund email (I have only got 25 points so my 200+ friend was going to notify me). Obviously can't tell if it was a refunded ticket and why it became available.
Long story short, don't wait for...
1. Ballot for Tier 1, 1A. 12 ('x' number of hours) to complete purchase, 2. Ballot for tier 1 & 2, 2B. 12 ('x' number of hours) to complete purchase, 3. Ballot for tier 1, 2, & 3....repeat
Could even not allow previous tiers the option again.
I dunno maybe I'm just annoyed I didn't get a...