Actually it makes perfect sense for a poor country to buy the latest aircraft - they're fuel efficient, break down less often, establish a viable source of income, etc etc. As far as the hungry, powerless populations in these countries are concerned, they're irrelevant to fleet plans, much in the same way that an ageing population is irrelevant to a country's investment in high speed telecom services, the internet, etc. A country like Pakistan has a huge middle class - I'd say about 20-30 million strong - who travel overseas for business, pleasure, work, etc. There is an enormous Pakistani presence in the Middle East, not all of whom are day laborers, but who are white collar professionals. Add to it, the nearly 1 million strong community in the UK, and another 400,000 or so in the United States (who tend to be stolidly middle to upper middle class), and you have a perfectly viable source of passengers who demand new aircraft and good service.
Look at Ethiopian Airlines - during 20 years of civil war, a repressive communist regime, famine, etc, they ran a fabulous airline with the latest aircraft, service to rival any upper echelon European carrier, and made money to boot - which is more than I can say of many other airlines who bleed cash even in the best of times while offering churlish service.
Atheism is Myth Understood.