I really, really hate copyright. I understand perfectly well that no one wants their original idea to be used for someone else's credit and monetary gain. Stealing someone else's idea for profit is evil.
I don't mind if you make an army of pigs, frogs and whatevers from my patterns, because your work will be going into them. Please don't just sell the patterns themselves, though.
But what I hate is that since we have project-sharing forums like craftster, and sites for selling homemade things like Etsy...everyone gets inspired by everyone else's irresistible ideas. Then someone yells THIEF and the crafting community turns sour.
One person on Craftster did say something that made sense, though: Whenever possible, bring something new into the world. You are a special, unique bundle of experiences and the things you create should be unique to you.