In reply to Dave J:
I might have guessed that this topic would degenerate - just because someone doesn't like religions and all the claptrap that goes with them doesn't prove he is a racist - he just feels threatened, that's all. Being PC and not facing up to real fears, whether justified or not, doesn't really help, it fuels racism if anything as you push people who already feel vulnerable into guilt and anger, and the whole cycle just builds up.
Back to the subject, which has often puzzled me too, I don't think it is a question of money, nor literacy (the odd Scot apart) but is easier to understand if you just look at the history of climbing, in which country (GB - first industrialised country) and which class (upper middle classes) it started.
The notion of doing something that is tiring, cold, dangerous and generally nasty untill you get into it can only start in people who have a comfortable and perhaps rather boring lifestyle. Looking for risk is basically odd, especially for people who have had trouble just surviving, it takes several generations to to change cultures. Working class climbers only started becoming common (oops! What I meant to say...) 50 years ago, then they blew off the gentlemen in tweeds; in a few years, if athletics are anything to go by, black climbers may do the same.
As someone said above, the Japanese are pretty active and even more bonkers than European climbers, it needs a sociologue to put it all together in a coherent and documented way. Come on you young sociology students, one of you could knock up a 10 page article and put it on the internet with a link back here!
At least it would avoid the silly "racist scum" sort of remarks and it could be the beginning of your road to fame...