Distributing Confidential Surveys

Many companies have their clients fill out surveys before opening an account. Most of these surveys have the boxes that ask you to mark them if you do not want them distributed. The problem with this is that some people are so anxious to open their account that they only fill out what is highlighted. This leads to the mass distribution of personal information. I would like to know how other people feel about this topic because I know that I do not like it when I get a letter or call about some item and the sales representative knows all my information.