HBO have the lowest non-carry-on rate out of the major networks. Meaning that a HBO pilot is much more likely to make it to a full series than a non-HBO pilot.

HBO have the lowest non-carry-on rate out of the major networks. Meaning that a HBO pilot is much more likely to make it to a full series than a non-HBO pilot. They also rarely use the pilot process. A lot of the big series are just approved and produced as full seasons.