yes, you're right, it does have an american (US) bias, and an middle class one too, since math camp --like all summer camps, is a middle class endevor.
my son went computer camp for 4 years-- the first year of camp, we sent him to a real camp,--a boy scout camp--hiking, outdoor activities, etc, but his alergey/asthma was a problem. computer camp was less likely to end with him in the emergency room, cyninotic! and he liked it just as much.

as a friend remarked last night, (while we were watching the show the moon was putting on)- PhD. are a middle class pursuit. --the rich (i.e., dubbleya) don't need them, and the poor can't afford to spend 8 years after HS going to school. geekishnes is also somewhat middle class, too.