I think that this is the right answer. Apollo had a very young, smart, energetic workforce. There are a limited number of these people in the country, and cer

I think that this is the right answer. Apollo had a very young, smart, energetic workforce. There are a limited number of these people in the country, and certain projects attract them. Apollo's ambition was very attractive to these people in a way that the shuttle wasn't, and SpaceX is. IMO SpaceX's workforce is the key to their extreme success, and they are able to get that workforce because of their ambition.