Business 101 -- try to extract the most money possible from each customer. This works best when you segregate customers. IE -- get the rich guy to pay more if you can.
Give you an example:
A lot of college books sold in the USA are hardback books that cost upwards of $75. (sometimes as high as $125). You can get a used one for cheaper... OR you can find a paperback "international version" online that's being used in India. Same book, just paperback vs hardback and a slightly different title. Sometimes pictures in the book are black 'n white instead of full color, but that's rare. So, you can get this paperback international version through say... ebay for only $35 including shipping.... from some random bookstore in India which is likely making a killing in profits even w/ that low price.
So, why the 2 prices and 2 different versions?!?!? Because in the USA, college is expensive and paying that much for a book is relatively small amt compared to the cost of room, board, and tuition. In India, the book publisher would not sell any books if they sold only hardbacks at the full price, so they make cheaper paperbacks that are a bit smaller, lighter, cheaper to make... but have the same content. They still sell them for a profit, but not as high a profit as the hardback versions in the USA.
Same for lots of things. Different regions are willing to pay different prices even for the same quality, and if you can restrict selling between regions, you can extract exactly however much each is willing to pay so long as you make a profit.
Say I make something for $5, and I can sell it to Americans for $50, Australians for $45, Europeans for $40, Asians for $20, and a few other countries for only $7. I still profit from each region, and you might think I'm making more from the Americans than the Asians... but you'd probably be wrong. Sure, each American gives me $45 profit and each Asian only $15, but there are a billion more Asians than Americans. You have to factor in price and volume. You may ask why even bother to sell to some countries for only $7 -- well... b/c if the choice is don't sell to them at all or make a small profit, why not make a small profit? As long as the countries I sell it to for $7 can't re-sell it to Americans or others that regularly pay more, then they aren't cutting into my profits.