"exchange will be limited to charter members of maast"
this would kill the deal for most business owners. Could you really see a business owner turning down a sale because the potential customer was not a member of a certain club? Then, can you imagine the store owner telling this customer "you'll first have to pay to be a maast charter member, then you will have to give me $5, and then you can shop from these tanks"

As for care of the tanks, there are only 2 places in town that I would have any confidence in doing a decent job. Can you guess which ones?