For a flight that doesn't reach orbit and stay there with the environment in 0G for at least a few orbits, I wouldn't pay anything. Heck, I won't pay a commercial airline to fly because the ratio of inconvenience to convenience+enjoyment is too high between the (id|patr)iot act's enforced paranoia and the seating designed by one-legged, one-armed engineers. Now an oceangoing cruise liner, that's something else again. I loves me a nice cruise. It's even worth going first class, which it definitely isn't in a commercial airliner.
However, for a flight that *does* go to orbit and stays a few turns, and doesn't require a spacesuit, and for which I could have a very private cubby with a view for two for the orbital duration, I might part with as much as five thousand for two seats, just for those few hours. They'd have to let me take my camera, though.
Which means I'm not going to get to go.