Just gonna throw this out there... But are you aware that the UK has to pay taxes on all imported products? Even digital copies and its added into the prices. You pay 15 to 25 percent more and that's just how it is, bungie doesn't set the prices. Aussies get the video game tax also as we'll as VAT in some circumstances.
Do some research and you'll find out there are alot more things you pay almost double for.
English
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A. It's not imported B. Sales Tax in the UK is 20% (VAT) C. Activision/Bungie DO set the prices.
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Digital goods can and are considered imports if the origin country isn't your own
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The retailer for Europe is Sony Computer Entertainment Europe - a European registered company - so it's not imported - a European company is selling the DLC to Europeans.