If we bother to take a look at the long term effects of space tourism/exploration (yes, I do consider them the same thing) we are likely to come to a simple conclusion. We are going to become a space faring race.....one way or another. We just happen to be at the "Beginning" of what will probably be remembered as the Golden Age of exploration. I honestly believe there will come a time, perhaps 100 yrs. from now, when humans are routinely travelling to outposts or colonies on other worlds. This challenge has to start somewhere/sometime, and I see no reason it should not be now.
The initial investments will be relatively small when compared to the payoff....at least our grandchildren will likely think so.
Now it looks as though the Space Elevator will become a reality as well, which will speed up the proccess incredibly. Unfortunately this is still decades away, which makes commercial activity that much more important. Whoever makes the first Space Elevator, will have an anormous advantage over everyone who follows, and will in essence....Own Space.