it depends... most of the time i crack all my PC game, and burn/rip movies to the TV computer, so if the disks get damaged i dont care.
i have tried restoring a CD that i love, that my ex scratched the heck out of making it unplayable. using said ways with no luck. i ended up buying a used copy at cash-in-culture for 4 bucks.
besides, i pirate everything anyway. lol cheaper!