The whole file-sharing thing gets to me. Fundamentally because nobody asks you if you want to share your files, they make that decision for you. OK... record companies do the same thing to many artists as well, using and licensing your work in ways that you hadn't envisaged. The file-sharers and rapacious, bean-counting record companies are as bad as each other in some ways. But the record company may actually provide you with some reward for your inspiration and perspiration.
If people have no reward for their bright ideas - be they musical. commercial. scientific etc - they will either stop having them or just keep them to themselves or stop developing them. Why put in a whole bunch of work for something that somebody else can just take and do what they want with?
If you want to give your work away, because it stimulates other forms of income, because it helps to increase your profile, just because you're that kind of person, or for any other reason under the sun, then you should be able to do that. Strangers should not be able to make that decision for you. When they do make that decision it should not be called "file sharing" it should be called "impertinence", "bad manners" and "theft".