That's a good thought, although like what was mentioned already, the Blockstream satellite is already operational. Also, one does not simply send out a satellite into space without having a special permission as it might interfere with aviation in general, and could be dangerous if left unattended. For deeper launches, it will require tons of money, careful planning and again, coordination with aviation authorities as this might hinder explorations and missions on space. Fascinating as it may all seem but it's tedious to the one who's gonna launch a satellite up there which will serve as a node.