Josh agreed to answer a few questions via email, so I asked him about the Zenpool payouts. His responses are in italics.
5. If there is some other source of payments that gets put into the Zenpool, can you tell me what that source is in a general way?
The majority of income comes from private companies leasing hashing power for us for specific experiences/projects they are doing.
Not bad. Basically a black box. I wonder though where those private companies are hiding that hashpower and why.