I haven't done it and I'm not planning on it (though I may send a link to my sister, the only other person I know who owns an e reader). It's just that when I first saw this, I started wondering to myself, "so what's to stop people from simply referring to dummy e-mail accounts and then claiming 50% off coupons plus $10 for each of them?" When the DRM issue was pointed out, I realized why it's an issue for most people and why I hadn't thought of that as a reason why it wouldn't work, because I happen to strip DRM from my books for personal backup so it didn't even occur to me that this may be a problem.
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