The only disadvantage in surviving a dangerous experience lies in the fact that your story of it tends to be anticlimactic. You can never carry on right through the point where whatever it is that threatens your life actually takes it - and get anybody to believe you. The world is full of sceptics.
Everyone who's been in space would, I'm sure, welcome the opportunity for a return to the exhilarating experiences there. For me, a flight in a shuttle, though most satisfying, would be anticlimactic after my flight to the moon. Plus, if I pursued a flight myself, people would think that was the reason I am trying to generate interest in public spaceflight. And that's not the purpose - I want to generate interest in long-range space exploration.