Regarding flipstyles valid argument of maza's adoption within the reservation's economy...
They could get around that if for example the local store (assume it's the centre of their economy) was owned/funded/operated locally via membership in a co-operative or collective.
The local store would make available the option for shoppers to purchase goods with maza.
That would then spread the financial burden of adopting maza to the community, instead of a sole owner/operator of a store or a wholesaler/supplier of goods to the store, who would never adopt maza due to the obvious financial risk.
So the task would be for payu to convince locals to back a business venture (say store or credit union) that accepted maza within the reservation.

As I see it all comes down to whether the coin's economy should've been built-up from the ground within just the reservation and once it was ready then publicise it to the outside world for investors.
OR the way it was actually done, by trying to get investors to boost the price through speculation to encourage the reservation to adopt maza because of its high value. Except that hasn't worked out as we can see due to oversupply of the coin that undervalued it.

Unfortunately it looks like the horse has already bolted, unless there's a hardfork to lower the reward eventually.