Not to get greedy, but does anyone know if the prizes are cumulative? Or, is there an option to choose any one of the rewards that are at or below your achieved tier?
Eg. if you get 4 referrals, do you get:
Gigafactory invite + Tesla jacket + weekender bag?
The reason I ask is that, for example, what if someone gets 4 referrals but can't make it to the Gigafactory tour, are they out of luck on incentive?