Why is Composition in Landscape Painting Important?

Composition is a very important aspect of landscape painting but one that is surprisingly overlooked. I have visited many art galleries where there are landscape paintings for sale, some with very high price tags that have terrible compositions. Some of the compositions I’ve seen are so bad that it’s at that point I think to myself am I missing something here? Did I miss a meeting? It’s a shame because I have seen many a potentially good painting that has been ruined by a bad composition.