You're missing one major factor: There's no requirement for potcoin to be of any particular value. This isn't a stock program. This is a monetary transaction shifting system. The value is set by pure speculation.
And if say 2 or 3 merchants pop up and say a gram of grass will cost you 10M/pot, well now you at least have a price point. Could talk for hours about this, but I'd rather hear from potcoin, particularly on my inquiry on the previous page.
But when the price is primarily held up by speculation, you have to give people a reason not to speculate that the price will go down.
I can without a doubt honestly say that in a week the price of potcoin will probably be down another 10% guaranteed, so what incentive does one have to buy potcoin if they can not spend it locally? and what incentive do people have to accept potcoin if they would have to charge say a 5% premium to shield them-self from the inflation? cash fiat seems to be the best way to buy marijuana as it stands.
Best angle would be to dump all development work into making the mobile app as easy/stable/safe/convenient to use as possible so that people can conduct illegal pot purchases anonymously and quickly via phone to phone.
Thats your niche market you need to exploit.