I agree which is why the episodic (sp?) model works best with exclusive content -
Like Survivor - they keep coming back to see what is going to happen next. Doesn't have to be reality - Soap Operas work the same way, and taking a point from the story development is not so much required as long as there is a cliff hanger. Always leave them wanting more
The sites we have done that way are showing an a low average of 5.2 months (mostly because customer stopped production) to as high as 9.4 months (keep producing weekly- they keep coming back).
Biz 101 - its easier to keep a customer then to get a new one.
Episodic, Reality - it all means the same thing - $$$