Kimmy is 100% correct and she is speaking from experience, not from theory. Whatever you model, there are ways to make it work for you the way YOU want it to.
VOD - simple, easy to set up and can be done with the same files you currently have in your members areas. Offer them as individual plays or from access to the entire site.
What about giving away the content and then capturing back the traffic. I will write an step by step on this over the weekend. I wrote a piece a few years ago that AVN and a few others published and we ran it on our old DRMDaily site.
http://drmdaily.com/DigitalFeedback_Article.asp?ID=1001
It may or may not spark some ideas.
To be continued on that....
As a continue to ramble, I would inject this...TRY IT OUT, it will not cost you anything to try it out. Let me show you what we know and see if together we can get you rolling full steam or even half steam.
Even if you are using another provider, give me a shout, I am on ICQ 15 hours a day (254 33 4), I may be able to help you improve your model without having you switch providers.
Let me know, I am here.