Unfortunately there isn't much overlap between danger addicts and people with the skills, foresight, and pragmatism necessary to make a mars colony work.
That's not to say there are no good candidates for colonists, they just aren't like the guy that you're talking about. They are more like our current U.S. astronauts for whom getting a Ph.D. is just something they do along the way because they have a ridiculous amount of discipline and aptitude. There are many more qualified applicants than there are spots for them to fill, and there would probably be even more if the space program were more real. Interplanetary viability of the species is something that even very pragmatic and intelligent people are willing to risk their lives for.