When drilling you make a mess anyways

Mess always has to be cleaned anyways

You have to dispose of your drilling mess anyways (you sure dislike making a mess that you have to mention it thrice, diy might not be for you)

Its not a waste if it does something (it does if not much)

Instead of 'worrying', see it a case of good practice.

Is oil 'required' for this? Well no. But it certainly wont hurt anything other than your fear of having to clean up after :p