So, does it mean that the products will sell at Tesco, Biedronka and the likes?
I really doubt it, since even Polish people don't know those things, they wouldn't sell too well :)
of course oscypek is an exception, it's famous all other the country thanks to the people from Zakopnae selling it in all big cities of Poland
Also bliny and kołduny are familiar to many people, and I knew Szare kluski because for thirteen years, I lived in the area where they are from.