Things like this are why I hope you guys don't decide to just set the price at X Euro and call it a day. It would be wise to make some adjustments across currencies, even if you make a little less in the end from some countries.
It's difficult because:
- users get angry when they find out they could have bought it cheaper in a different currency (you'd feel like you were scammed, wouldn't you?)
- if users wise up and find out which is the "cheapest" currency, then the majority of people will simply buy it at that price, and then we might not be making enough money to keep going.
It's a shame that differences in economy make for an unfair deal. There doesn't really seem to be a good solution for everybody. At the end of the day though we need to make a living in the economy we live in (here in the UK), so we have to price accordingly. If you can't afford it, there'll be the free edition!