That makes me feel a bit pessimistic about space travel. If we didn't even manage to colonize our own oceans, despite it making some economic sense, given ludic

That makes me feel a bit pessimistic about space travel. If we didn't even manage to colonize our own oceans, despite it making some economic sense, given ludicrous prices charged for houses/apartments/dwellings at land, how can we realistically hope to settle other worlds?