Using HDR techniques you can really go overboard with the effect and make images that end up being slightly alarming to the average viewer. Most people are looking for landscape images that are somewhat nourishing and soothing. Here are examples of two images, the one with the dock uses HDR techniques with a lighter touch, the one of the Lake has HDR dialed up to the max. I am not sure if anyone would purchase the overcooked one as wall art, it is slightly alarming and a little overwhelming (it is fun to make from a personal standpoint though!).