On the one side, I see space tourism as a waste of resources if it is not for some scientific goal. On the other, it often is. Private corporations have a restriction that governments don't: Money. So they try to make space flight as affordable as possible while still upholding the same safety standards. Some say that those two goals are contradictory, but they really aren't. If a government loses a shuttle, it's a tragedy. If a corporation loses a shuttle, it's bankruptcy.
So ideally, corporations get funded by space tourism and make space travel more affordable. Then governments can pay those corporations for their flights rather than funding their own, more expensive shuttles. Cheaper flights equals cheaper research which equals more research.