You've made you point so thank you.
But I have to disagree with you on that point, a lot of market research is done this way, for instant I could ask a selection of people which colours they hate seeing on websites and which they don't and if the majority came back and said that red websites put them off a site then I would know to stay away from that particular colour.
But anyway we could probably go on discussing this point for ever or until one of us became bored, but hopefully I can get some others, to see what their thoughts are on the subject.