You didn't give it enough time. I lost over 10lbs in the first 2 weeks. It is just hard to maintain the diet.

You cannot give up after 3 days on anything. Some people don't even lose anything in the first seven, but almost all get results in the first two weeks. Also, you have to make sure you followed it perfectly. No substitutions. And also, you have to be following atkins according to atkins, not according to cousin joe or your friend jane.
And if you don't get results in the first two weeks, there is another kind of induction for people like that.