"Plus you now have a choise once you receive the car.. You can always use some plugs to cover the holes up when you decide you don't want the spoiler on.. " [edited for good taste] : )

You'll have to add a brake light to the rear deck too though, which doesn't look all that easy to do properly. As for plugging the holes, a trunk lid swap with an owner who wants a spoiler (in the same color) would be a lot easier.