For many pairs of countries the price of sending a letter from A->B is less than sending a letter within B. In addition I imagine the labor costs of having people stuff envelopes will a significant source of costs. So you're probably better off picking 3-5 central points with cheap labor and cheap postage, rather than opening dozens of small centers all around the globe
That would be great as if there was no one servicing your area you could potentially sign up as a 'poster' allowing more remote areas to be connected if someone was available.
