Movie posts can be tough to convert because you and other webmasters just gave them movies for free...so it's a bit harder to work them to pay to see movies...I would suggest using a movie oriented site and use your gallery as a sample of what the site offers...I assume you've done that, but have often learned not to assume anything ;)
You may also want to look into some of the payperview/vod stuff or even direct your advertising towards sites who emphasize live shows...
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