My 4 month old Macbook has dark marks from where my palms sit. Yes I know it happens and I was going to use the eraser but the plastic actually looks etched. My 4 year old Dell D620 finally started to develop that look after year 3 and it got heavy usage. So the plastic looks damaged from a regular use point after 4 months. Personally I do not care but I plan on selling it and going to a MBP but I feel after 4 months of usage that a buyer would expect something in close to perfect condition, which it is, except for the etching. Has Apple replaced the plastic on these that prematurely wear?