and whats wrong with inner space.. my issue is with the actual objective more than the dream.
when people talk about space exploration what they have in mind is more akin to science fiction than science fact.
Space exploration in science fiction says we'll find exotic and unheard of flora and faunas and super useful exotic minerals like unobtainium or something... Avatar is what people think of when they think of space exploration.
Space exploration in science fact says that the overwhelming majority if not totality of the material in the solar system is made up of minerals and elements that are already found in abundance on this planet. We've sent umpteen probes to check out the surface of the moon and mars and found pretty much nothing out of the ordinary. Putting people there is in reality space spelunking and no different than what people do in deserts and rocky places here yet you don't get a hard-on when scientists have found extreme-ophiles (microbes that can thrive in the harshest conditions and environments like acid) on THIS planet.
Which brings us back to inner space and again the fact that less than 10% of THIS planets under-surface has YET to explored in any real systematic way. And that environment is every as hostile as space so its not like technological advances would decline because of it.