Just because someone is a volunteer does not give anyone the right to be cavalier with someone's life.

Also, space flight is not only expensive, but also the training is argious.

You can't just take random people off the street, blast them into space with a slap on the back and a good luck. It would be certain death.

So until humans understand and are able to overcome all of the hurdles preventing us from living in space permanently, any attempt to do so is pointless.