In other words, you think it's okay to exploit people?
If you're writing software for a global corporation on a global marketplace (The internet), why would it be acceptable to be paid based on regional politics, which is what local economies are reflective of.? Especially considering the politics of third world nations is manipulated and controlled by the governments of first world nations for profitable gains.
No, the only acceptable answer is to pay all developers equally regardless of region, based only on their capability, and perhaps their investment of time and effort into their own improvement.
The Pre-Internet Planet Earth and all the little tricks that our ancestors injected to make it easier to take advantage of less fortunate people needs to end. Their guilt isn't yours until you decide to ignore your morality so you can make a few easier bucks. You cannot be a willing and informed participant in this systemic evil and pretend that it's anything but.