Yes I think mussels taste quite good.
It's funny, but a lot of shellfish type foods were once considered food of the lower class because people were able to go to the shores and fetch them themselves. But somewhere along the way, decades ago, they became foods of the upperclass. Maybe not Mussels specifically but things like lobsters and crabs and oysters are quite expensive generally.
I'm not familiar with "country" Mussels.
Ya, I have tried Lobsters once - pretty expensive here.
Pretty expensive everywhere I think 😅