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If they are trying to prevent people giving copies to their family members DRM doesn't do it. Those people typically are on the same account and can read all the books there legally. Friends are perhaps less often on the same account but it is not really uncommen either, there are joint reading groups. Also now that there is legal sharing on both the kindle and the nook there is a legal way to occasionally share with people who aren't on your account.
As for people hosting torrent sites. Those people can strip DRM in a few minutes, it doesn't even slow them down. Or they simply buy a paper book and run it through a scanner to produce their file. The Potter books have been available since they were published. DRM is a failure here also.
Also I do not believe that having the book on a torrent site really hurts sales. Most people are willing to pay for convenience and service. Amazon is a one stop place for buying books. No need to search the net trying to find the book you are looking for. You know Amazon is safe and you won't be downloading viruses or malware by shopping there. If books are updated and errors fixed Amazon will notify you and send the corrected book to you. They backup all your books for you free of charge, a useful service. They keep track of your notes and underlines for you. And they sync your books over multiple devices. These things apply to most of the legitimate vendors, I'm just using Amazon as an example. Most people prefer to buy things legally and with all the advantages you get from legal vendors I do not think the torrent sites really cause much loss of real sales. They lose more sales from people who don't like DRM and are afraid of one day losing their investment in books due to orphaned readers that are no longer supported.
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