All three of Musk's most recent ventures (SolarCity, Tesla, and SpaceX), depend either on direct or indirect government subsidies. It's not just that Musk is a workaholic, or possibly innovative, but his ability to "work" the system that sets him apart. US tax payers are paying a significant portion of the bills for his ventures. Since I agree with his goals, it doesn't personally bother me very much but it still is something worth thinking about.