I don't know any facts because I don't live in Europe, but it probably has to do with popularity, slight shipping differences, and another factor or two. Because of popularity of LEGO in Germany, it would make sense for them to raise the price a tad while lower it in a country less infatuated with LEGO. Shipping shouldn't affect them much in Europe compared to shipping to a different continent. Also, I'm pretty sure that inflation in countries is different even if they use the same currency.