Musk reckons he can sell people tickets to go all the way to Mars for $500,000, so apparently he thinks the cost of LEO can go much lower than $1 million a head.

As for your robots, I do agree that most work in space will be done by robots but unless and until they can match the manual dexterity of a human being it will be desirable to have some people on hand, and thus organisations interested in space will do so if they're able.