Contest Anxiety
Holding a contest on your blog as a way do generate traffic has a catch 22. You will not get effective word of mouth about the contest because people who find out about it do not want to dilute their own chances of winning.
About a year ago a held a contest on a humor blog that was just for fun. The prize was a mystery object to be sent by snail mail. I only got one entrant. She did get a reasonably nice prize. I enjoyed the absurdity to some extent. I wish I had gotten more interest.

