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The rim's outer most diameter is important for tire retention (as well as a few other design factors). I would not sand it down. Now the rim's well, the lowest diameter between the bead seat beds, is very important to tire mounting ease.
To answer the simple question. Yes, we see rims that have been ridden with no tire, on paved surfaces, resulting in the same effect of sanding every so often. (Keep working in the LBS field for years and you'' see a lot of...) Now the "sandpaper" is rather coarse and the rim's side walls tend to also have some pressure "molding" (to put in mildly). Please believe me when I, and others have said, suggest you don't do this even with hardware store bought sand paper. Andy
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AndrewRStewart