Thank you, everyone, for the great advice. Please forgive my ignorance here.
The reason I am asking is, I have heard that natural oil and sweat from hands (living in a hot climate here) can cause some staining on the trackpad (it has happened on all of the 5-6 PC laptops used in the past).
I know the keys on the keyboard will eventually get shiny due to friction, but it would be nice to keep the MBA in good condition for selling in the future.
Would you still recommend not having a trackpad shield, or even a keyboard cover?
Thanks once again!