Installed Cliffys and Mantis protectors add value. Maybe plastic protectors as well. There's install time and material value there. And it protects re-sale value maybe with less wear. ColorDMD is value added. Freshly installed decals properly done is added value, tossing in a fresh set of decals and saying I never got around to installing them might not. That said, colorDMD can be removed if the buyer does not want to pay for it. The others are in for good. Sometimes shakers came from the factory sometimes installed aftermarket. My opinion, if it can be removed, the seller can determine if he wants to sell it separately if a buyer balks at paying for it.

A playfield protector can be cut off, but in my opinion a protected playfield might command a premium if installed right from NIB.