In reply to Pj84:
Gave me something relatively interesting and difficult to occupy my mind with while I worked a white collar job in the first world.
I think we evolved as a species to be this creature that can engage in physically and mentally demanding dangerous circumstances. In the first world, as a society we spend our time removing all risk, sanitising all the dangers. Making life predictable, devoid of sudden death, fair. Removing all the adventure. Instead of the old stresses we had, of staying alive, staying warm, staying well fed, we have new stresses - office politics, mortgage repayments, traffic tickets, keeping the boss happy come performance review time.
It's IMHO too much of the wrong sort of stress, the time frames are too long - a mortgage with high repayments is going to stress you out for years. I'd much rather than "did I rig this abseil right?" stress that lasts a few seconds, depending on how far the fall is.
For many of us, our modern work life can be too damned boring. We need something to balance it out. We need the adventure that living in civilization has robbed us of.