I have a large personal collection of dvd's but I don't make any backups because I don't see the need. Once I have viewed it a few times I 'm probably not gonna watch it again. Once it becomes unplayable I through it away because it is probably a old movie by then. I have friends that makes backups and then they end up giving it to someboady else and thats definitly not right. I ask peolple why do you need a backup of a movie disc and mostly they can't tell me or say because the other might get scracthed but nine times out of ten then loan the backup out to a friend and forget about it which is basically piracy even if it wasn't the intention.
Because I can watch any movie I want with the click of a button, or on any device I want, for my own personal use.