Many people have commented the same thing as you in the past, and I will tell your the same thing I told them. Why does it have to be either/or ????

We have enough manpower and resources and numbers, to do both space exploration as well as deep sea exploration or any other Earthly explorations for that matter. It might not seem that important but in the future if for any reason, Earth becomes uninhabitable or we are faced with an end of the world scenario, THEN we will realise the importance of expanding our presence out in the cosmos and to colonise other planets.

Personally, I don't care if Elon Musk is doing it for the money or for any other reason under the roof. What I care about is he is single handedly bringing change in several key areas which should have been developed by now. Yes, we would all like to see him unveil the wireless future that Nikola Tesla had in mind, but who is to say, he won't in the future?