Every team has a tier (T1).
Everyone on a team needs to buy the tier-specific join pass.
T1 = Teams led by people who have never submitted before.
T2 = Teams led by people who have submitted an Ignite project once.
T3 = Led by people who have been elected to the top 50% of a T2 team.
T4 = Top 50% of a T3 team.
It all depends on the leader; the members don't matter.