France is visited more than any other country
I'm sure it is. Like M says...art, wine, cheese filet minon ;) What more can you ask for? Not sure about their beer though.
It's possible that not enough PL bring zloty into the country. When I travelled with my gf's family, they always exchange currency before leaving the country. I'd imagine this would also be done at the Airport.
It's not only France. We have a large PL population in NJ, but I can't exchange in a Bank of America or Commerce. If I go to a PL neighborhood, maybe one of their banks would. It's not common here anyway.