Im thinking of pre-purchasing the new expansion and I stared to wonder if I buy it from the US shop in dollars,will i be able to get them on my Eu account.Reason is cus in dollars it is a lot cheper then in euro.
I do not think it is server restricted: you buy with the currency of the country you currently reside in... Do not take my work for it, check before but I think you can use dollars (ideal being buying amazon coins with dollars and buying with the amazon coins of course)
No. Each Server region is a Separate Collection. If you buy packs on the Americas Server, those packs are locked to that region. You need to buy them in the Europe Server to access the packs in your Europe collection.
That said, the currency used to purchase packs is not defined by the server you are using, it is defined by your account settings and region. I'm from Europe, I live in a country with Euro as the currency and my Blizzard account is set to my actual country as region. No matter what server I log into, the price is always displayed in Euro's.
Even if you can fool blizz into taking a USD payment for your EUR account, that will be worse than just using amazon legitimately in the EU.
The super optimum rate would be to use US amazon to do a US blizz purchase for your EU account, but then you would have to fool both Amazon and Blizz systems to let you use deals intended for US customers.
In total this will probably save you around 10 EUR at most compared to just doing it with EU amazon and is probably a lot more hassle than it's worth. Also when something inevitably goes wrong and you have to call amazon or blizz customer support, you're going to struggle to justify what you're doing.
Or you could stop trying to be a cheapskate and scamming the system. Just an idea. You have to pay tax on paying dollars from a UK bank account anyway.
Well, if Blizzard actually went through the effort to implement the feature (they did, you can go to any store and purchase the packs to use on another region, you just have to specify the region and lock it in), it implies they have no problem with this, no?
The other part of your statement is... interesting. You guys have to pay additional tax when purchasing stuff in foreign currencies? How does that work? (I get that the bank would have an unfavorable conversion rate, but a tax??) And I thought my country rips people off...