Before anyone tries to estimate how much space tourism will cost, remember that the actual weight of humans will make up a tiny fraction of the total weight of any orbiting hotel. Probably need to multiply by an order of magnitude or two.
But, longer term, consider what happens if/when there is existing infrastructure in LEO and highly productive and profitable work for an individual to do there. The cost of actually getting to LEO will be a relatively minor relocation cost, even at these numbers.
http://www.nasaspaceflight.com/2009/01/musk-ambition-spacex-...
then we can start looking at paying ten times less.
What productive work is there to do in LEO? I can hardly think of any, and NASA was scrapping the bottom of the barrel looking for worthwhile science to do on the international space station.