Some of my initial fears of posting reviews. 1. Fear of being recognised / found out / traced. 2. Confidence in writing a review. 3. Security of site. 4. Getting criticised, (fragile ego syndrome) I now know it's just humour
5. What jargon and abbreviations mean. 6. Embarrassment.
Other reasons, other people may have. 1. Too busy punting
. 2. No time. 3. If everybody reviewed, the site may crash. 4. Not necessary or compulsory for members. 5. A wish to stay a secret member (lurker).