I think it is way too expensive for most people--of course! Then, once you are a multimillionaire, you probably are older and have a family--less ready for risky travel.
I like the idea of awarding space flights as prizes for excellent science students. I wanted to join the teachers in space program, (but it is for teachers of children, and I teach adults) and also I entered a contest years ago that I really wanted to win-- the prize was a trip to space. The person who won took the money instead of the trip. Sigh.
I'm not sure if I would go now, (my older son asked me to please stop trying!), but I would have before... and I might later.