One discussion about the above compared to the risk of extreme mountain climbing, and suggested that the risk wasn't likely a deterrent to most of the target demographic. For instance, according to Wikipedia as of 2004 only 246 people have completed the ascent of K2, with 56 deaths (some on the way down). I'm reasonably sure private suborbital jaunts can be made safer than that.

The question is whether their business plans can survive an accident.