Regional prices. To not abuse regional prices, and to make it work, they have to lock it. Otherwise some regions would have extremely expensive games. But because they could not afford the games otherwise, the regional prices takes this into account and sell the games for cheaper in those regions. If everyone outside the world could buy there, they would. Then it would be pointless for the publisher, because the cheapest price is then the normal price.

So regional prices is not here to make it expensive for you, but more like make it affordable for those, who wouldn’t otherwise able to buy. At least that’s the idea as far as I understand.