I didn't come up with that rate...that's what he charges all of his clients. It is double what I pay my team in the Philippines, and considering that the average monthly wage in Belarus is under $150/month, it is quite generous (I paid him a month's wage for 3 days' work).

Would you react the same way if a Silicon Valley company hired a developer in rural Mississippi (the state with the lowest median salary) for $35,000 (the median salary there) instead of hiring locally for $150,000? Is that exploitation? Remember that the cost of living there is much lower, so he will enjoy a much better standard of living on a lower salary.