This would be the appropriate place for Govt. intervention
1) Make the profits highly tax subsidized. (low tax/ no tax on space profits)
2) Exemption from most lawsuit claims for most kinds of injury or deaths resulting from spacecraft operating accidents.
3) Perhaps some sort of easement or guaranteed limited exclusivity for certain kinds of space enterprises. Either geographic, time based or product/service. This worked pretty well in both the European exploraiton of the globe and in the development of railroads in this country. On privatization of space, it could realy help get things off the ground.
Ed