I don't think the mined bitcoin is meant to be thought of as a revenue source at all. I think the intention of the 21Inc machine is to have a computer that is

I don't think the mined bitcoin is meant to be thought of as a revenue source at all. I think the intention of the 21Inc machine is to have a computer that is automatically connected to the blockchain and can transact with others programmatically. I think the mined satoshis should be thought of a stream of digital ink -- ensuring your device always has enough ink to at least write into the ledger (blockchain). If successful, and 21Inc units become an inherent part of IoT, I think we would see a lot of satoshi level transactions that aren't meant to be quantified in USDs; the transaction will just be meant to show proof of interaction between two machines. Ex. your vehicle passed X checkpoint at Y time - use a satoshi to write it into the ledger.