I don't think there's a case for applying the principle to everything that gets done, only to some things. It's not an exact science but slag heaps are pretty universally considered blots on the landscape aren't they (?) so they seem prime candidates for applying the "polluter pays" principle. It's a better principle than "I'll make it look like a goddess to avoid the full expense of doing what I ought to" IMO. Fly tippers shouldn't be allowed to pile their litter into an artistic form. ;)