Dollars or Euro. Why not converted?

Why when I want to upgrade it says $29,95 for a year and $99,95 lifetime. But when I try to upgrade it says it's €29,95 for a year (which is $41.17) and €99,95 for a lifetime which is $137.40. That's unfair in my opinion?!? Why can't I pay in dollars then?

When I click upgrade and come to the pay site it automaticly says I have to pay 29,95 euro. I can choose then another amount but it changes the amount. If I click Dollars it doesn't say 29,95 dollars but 38,87 dollars????