Replacement disc policy
In my opinion, software publishers, music labels etc, should all replace faulty discs and here is the reason why:
You have purchased a license to use the copyrighted works and you have not actually purchased anything else. Faulty media has not expired your license to enjoy the copyrighted works.
Many years ago, I was reinstalling my PC and the 2nd install floppy for Lotus 123 was bad - I blame the floppy drive because I never cleaned it. However, Lotus Corp happily sent me a replacement disk in exchange for sending them the faulty disk and enough postage for them to send me a replacement. That seems very fair and reasonable to me.
I think that any company selling works and who will not replace faulty media should inform people that they are purchasing the whole works and should therefore treat the media as a master - ie, the buyer can make further copies, resell, etc etc because they are owners of the works. In doing so, they don't need to furnish the new owner with replacement copies should their master fail.