@dan - I assume that you guys will have consumables for sale at launch?
Have you considered doing an option on the referral program where someone could take their XXX back on their card the way the program is already set up, OR give the option to receive some sort of discount incentive on consumables to keep that in your pockets? I know personally, I’m going to be looking to use mine to generate some , so I'd gladly roll at least a chunk of my referral into consumables if it’d get me more bang for my buck on material than I’d be able to get otherwise.
Just a thought.
…or maybe I’ve seen too many episodes of Pawn Stars where they’ll give in cash or + in trade. 