Equal Value for All Affiliates

There are lot of people who are engaged in different online activities to make money on the Internet. As Internet has global reach and access, geographical location does not make any difference. The job and the tasks are often simplified, but when it comes to payments, there is much doubt about the transactions and the reimbursements. Currencies vary from country to country and the rates are more or less same for everyone. This makes some people earn more as the value for currency varies. Say for example a data operator who works from South Asia makes more money than the one based in UK or US. Shouldn't the earnings be differential so that everybody gets an equal value for the work?