National Electrical Code 2014 requires ground-fault protection for personnel in dwelling units for all 120 volt, single phase, 15 and 20 ampere receptacles installed in the following locations:

 - Bathrooms.
 - Garages
 - Accessory buildings with floors at or below grade that are not intended as habitable rooms.
 - Outdoors, except where receptacles on dedicated circuits are not readily accessible, and are used to supply snow-melting, deicing, or pipeline and vessel heating equipment.
 - Crawl spaces 
 - Unfinished basements, unless the receptacle is on a dedicated circuit and used to supply a burglar alarm.
 - Kitchens where the receptacles serve coutertop surfaces.
 - Where a receptacle is within 6 ft. (1.8m) of sinks in other than kitchens.
 - Boathouses
 - Where receptacles are installed within 6 ft. (1.8m) of the outside edge of bathtub and shower stalls.
 - Laundry areas

Arc-fault protection is required in dwelling units for all 120 volt, single phase, 15 and 20 ampere branch circuits supplying outlets and devices installed in:

 - Kitchens
 - Family rooms
 - Dining rooms
 - Living rooms
 - Parlors
 - Libraries
 - Dens
 - Bedrooms
 - Sunrooms
 - Recreation rooms
 - Closets
 - Hallways
 - Laundry areas
 - and all similar rooms and areas

I don't know where you *shouldn't* install them, I only know where you are required and not required to. I guess you *shouldn't* install them anywhere they're not required, or you'd be wasting money?