We NEVER leave wand marks, I think they look awful and finishing the carpet by re-setting the pile is in just about every cleaning manual but I do it because it makes the carpet look great. I've never had a client ask for them to be left in. My first boss on the Cruise Lines absoluately hated zig-zags, 'they weren't there when you started, so they shouldn't be there when you've finished.'
BUT, we never remove wand marks, unless they are really unsightly on EOT's
Simon