one of the main reasons you can blame on your own people. people from countries such as your own are doing what is known as a "charge back" which means they are buying something from a vendor and disputing it with the credit company that they never got it. this makes them get a free product and the money back while the vendor is screwed twice(the product was sent and the credit company takes that money back). and being that it is in a country that the vendor can do nothing about it, they with good reason stop letting people from said countries buy products.
so please blame your society and not the vendors