Eating out is cheaper?

This article from MSN Money is saying that in some cases eating out is cheaper than eating in. I think it depends on what you order, but I could see it being possible. Since portions are so large, my fiance and I often get a salad and share an entree. Sometimes this can cost around $12-15, which is cheaper than cooking a shrimp dinner or many chicken dinners at home. I don't think this would work for everyone, but maybe eating out occasionally is not a bad idea AND is not detrimental to your budget.