Denim clothes are very cheap to manufacture so it's not surprising that, in some places, they're regarded as 'poor people's clothing'.
It's only gullible fools who pay high prices for denim. They're not really paying for the clothes; they've been taken in by advertising hype and they're paying for the label.
Anyway, if you think denim is expensive, you obviously shop in all the wrong places! I buy my jeans for �3 a pair from Tesco.
A pair of levis in Moscow used to pay for your whole holiday. Customs used to check to see you didnt have too many pairs in your luggage. You could sell the pair off your legs for a fortune in dys gone by.