Second hand shopping

I am a huge fan of second hand shopping, especially for my wardrobe! Actually, i go beyond second hand, i am obsessed by flea market bargains!
While in Mozambique, i noticed that ecxept for some high street shops that sold clothes made in some far Eastern countries and some shops of global brands, everyone was selling second hand clothes. Even the fancy boutiques by the hotel entrances! But most people were selling second hand clothes that were donated to charities in Europe and North America. The clothes are spread out on the pavement and street sellers loudly advertize their items to bypassers. I also noticed that many of the girls and women had a very good sense of style and wore creative combinations.
However, i was intrigued that the donations one makes from home are being sold to people with virtually no purchasung power. The only explanation i deducted that these clothes are being sold very cheap, just to cover shipping costs and customs. Plus that if a small fee is charged, the new owner is more likely to take beter care of the clothes.
As the items displayed on the pavement were actually in good condition, i even considered buying some. But i was troubled about giving lots away and then paying for it somewhere where it should be for free.
Having picked up a couple of pieces and inqiured about their price, i realized that they prices were not that low, they actually did not meet my flea market target.
And all that in a place where people commute on foot or overloaded minibuses, live in modest conditions and often don't have food at home and no stable source of income. Makes one wonder how the world works... What's the logic?