re: ebay
The points above are all valid.
As a seller, if someone wants to pay using western union ... I hold off on the shipping... I don't ship anything until I have cash in-hand. That has worked well so far. ... never feel pressured to ship something, just make it clear that if this is the payment method preferred there will be inconveniences for the buyer.
For example, I levied a US$20 surcharge on a sale to a Korean guy one time because he wanted to use WU moneyorder. But the truth is that my bank does charge more to process a moneyorder, and it takes 6 weeks. So the buyer waited 8-12 weeks for his item...
but he did not want to use paypal so what-to-do.
Abject poverty? I'm not so sure ... if they have recurrent access to a computer and internet. one time... in one week I had 2-3 African buyers use "Buy-it-now" and then gave ridiculous payment/shipping instructions. That obviously cost me the inconvenience of re-listing, and the cost of relisting.
so... sometimes in my auctions I have not hesitated to state " I do not welcome bids from Africans." ... Honestly, I don't care who it offends .. its not personal, its business.
And no one has complained about American sellers who have pretty much done the same thing to people in this part of the world for a long time... Malaysians, Indonesians ... and in some cases - yes, actually spelled out as not wanting bids from Singapore (the most recent one I saw is last week).
I don't see why anyone has the right to take the moral high-ground about it being discriminatory so long as their preference is not stated in an offensive manner.
Further to this.... I have bought from all over the world ... incl. the US, China, Germany, Russian, the Ukraine, Romania, Hungary etc. etc. .... and the only time I got 'taken' was ironically, not on ebay... by an American guy claiming to be religious. Worse yet, he had been up till then... a respected member of a forum we all participated in.
Of all the sellers around the world I've dealt with... I have found that language aside, I have found the most sincere sellers to be from the ex-soviet bloc (russia, ukraine) and europe (germany). They may not be as polite as those from the US, but when one understands their culture... sometimes they actually come across as more sincere.