Pretend for a moment I was a Stephen King level author. I then put out a book with an okayish cover but inside was the typical quality and content that my readers like. I then enter a cover contest. I decide I want to win the cover contest so I send an email out to my newsletter "Yo! My stuff is up for a vote, go vote!"
Who do you think would win that contest? The person with the best cover, or the biggest loyal following. I will leave the answer as an exercise for the reader.