I think flavour comes into it. We grow quite a few of our own vegetables, and I don't use any chemicals on them. The flavour is excellent. Could be because we pick them freshly just before eating them, but supermarket organically-grown stuff also seems to me to be flavourful. I firmly believe that chemical treatment of food increases the risk of cancer, which I definitely don't want! Also, most organicaly-produced meat and eggs come from animals which have a much better life in a more natural environment. Free-range methods and animal-welfare are important to me.