Giving feedback to questionnaire responders--an essential task?

Giving a quick feedback to responders of questionnaires, indicating how responders' views are similar to or different from the views expressed by their peers, could be considered good practice. It is relatively easy to produce feedback by using the research database and mail-merging a document with conventional word-processing software. Producing this type of feedback is likely to increase the respondent's involvement in a project and may even improve the quality of response.