AOPA has had some articles about users fees. They were talking about Europe and how there's a fee for a weather briefing, a fee to file a flight plan, a fee for ATC services, oh, you want to shot an approach this time, there's an extra fee for that.

Most foreign students say it's cheaper to get a ticket to the US, get an apt. for 6 months and fly all day than it would it would be to fly from the airport near where they live overseas.

And since things will be priced in the local currency, the exchange rate won't matter.