Stefan, it doesn't matter that you guys aren't selling your albums here in the US anymore. There are many fans that would love to see you at ProgPower.
Nightwish played ProgPower a few years ago, before they got big here in the US. They thought no one would stay for their set. The place was absolutely packed. The fans went crazy for them.
Freak Kitchen also does not sell albums in the US, but they've been at ProgPower two years in a row, and everyone loved them. They were the talk of the fest both years, along with one or two other bands. Vision Divine last year, and Pagan's Mind this year. People just went absolutely crazy for them at the kickoff party this year.
Honestly, I think you'd have a bigger crowd at ProgPower eager to see you than you may think. If anyone from ProgPower contacts you to play the fest, please consider saying yes! I'm even trying to get some friends to help me sponsor you guys - which just makes the cost easier on Glenn, since he pays for the lodging and airfare for all the bands who play. Even if you're asked to play the kickoff party, I'm confident there will be quite the crowd there to see you. Believe me, Falconer is rather loved by fans here in the US. And ProgPower is just a bigger concentration of us.