I leave my MBP nude also.
If i bought a mercedes, I wouldn't attach a protective tarp over the front bumper - completely undermines the beauty of the machine.
Thank you, finally someone who understands what I'm trying to say. I take my computer in and out of its sleeve countless times each day and *knock on wood* it has been fine. Same with my iphone 4, I don't use any type of case on that either. The ONLY situation where a case is useful is to cover up a laptop that has been greatly damaged, but is still working internally.