I'm personally not a fan of making the distinction. Generally, "not for resale" only applies to games included with a bundle of some kind - Uncharted and MGS4 bundles for PS3, for instance, have this on the back of the games included - and you'd usually want to list that instead. I can see why you'd want to add it if you bought a pack-in title used and on its own, but since that's basically an unofficial release at that point, it seems unnecessary to give it a distinct listing of its own. It'd be like listing loose SNES carts differently than those that still have their boxes, imo.
I would apply "not for resale" to promotional-only items though, like the Assassin's Case release of Elemental Gearbolt, which was a press giveaway and designed to be a distinct, non-retail item.