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His companies have a large pool of resources to draw from as well and they also have the ability to place those resources in specific places(Boeing does far more than just rockets and can't commit everything to just that).
He is an idiot and that is actually the reason for his success. He just throws money at projects taking huge risks even when they are not actually liable to see a return in the near future. Even Tesla has only just started making a profit and that has been controversial as well(Tesla makes a large amount of money selling environmental credits). The reason the big car makers have been slow to get in on the EV market is because they don't like investing too much into releasing nascent product lines that will only lose them money, they don't like to take huge gambles like Tesla is. Nissan came out with the first electric car and it was reasonably priced but still a nascent technology so range was low, Tesla sold a car with increased range but at a far larger cost. It is only now coming to the point where cars with reasonable range can be sold at a reasonable cost(thought they still aren't cheap) and because of that many of the big car companies(even Ford) are coming out with new electric models this year. Now that the technology has left infancy we are going to see much more interest by the large auto companies.