Have you ever participated in a survey with all the above questions and more?
I can tell you that people that agree to do these survey usually do so because they are told it will just take 5 minutes of their time, it's an old trick market researchers use to get people to participate.
Well these surveys drag out for much longer and it annoys people so they tend not think of the question and just blurt out a reply, look at the high % of don't know replies. That tells the story
This is where a well executed quick survey is a lot more effective, methodology is very important in doing surveys
