Space is never going to be significantly explored by people whose thought processes always end in dollar signs. Our best space ventures have been motivated by higher concepts than material gain.

Commercial space travel is limited to satellites and novelty 'spacecraft' like SpaceShipOne. The fact that private spending on space exceeds government spending on space is irrelevant when private spending is not being used to do any exploration.

It will not, in any immediate future, be worth going to space to get resources for use on Earth. Despite the (quite valid) concerns of environmentalists, we aren't going to be that desperate any time soon that we have to look off world.

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"I worry that, especially as the Millennium edges nearer, pseudo-science and superstition will seem year by year more tempting, the siren song of unreason more sonorous and attractive." - Carl Sagan, 1995