Why pay moar??

OK, so, on this account i can charge my zen for $50. Converted to euros thats about 36 euro.

Now ive made a new account.. and the option offered is not $50, but 45 euro. Thats rather strange, cuz it should be about 36 euro.

I cant seem to change it to us dollars and if you do the math.. youll see that if id go with the euro option, id be off worse, for the same amount of Zen.

Can someone explain this difference in prices for the same amount of Zen?