At some point, yes, there is a monetary value to human life. During the early days of space flight, it was something like $1 million per astronaut. These days, it's up to something more like $50 million per astronaut (inflation would put it as more like $7 million).

I don't have my original source on this, but here's a good article discussing that and the concept of "mission success": http://reason.com/archives/2012/01/26/how-much-is-an-astrona...