This thread makes me sad. You don’t have to guess at things or do math. Just look at the real world and see the examples of v4v working: No Agenda, Jupiter Broadcasting, Podcasting 2.0, etc. Then really listen to the show and reverse engineer how it works.
If your product is high-quality, and you’re honest with people, and you ask them to help, they will. That’s not a guess based on a theory. It’s a fact, based on the last 3 years of my life doing the Podcasting 2.0 podcast every Friday.
If you are trying to figure out how much your content is worth you’re already doing it wrong.
Do the things you named make enough to support themselves from v4v alone or do they have some means of monetizing?
Why would it make you sad Dave?
I’m not saying V4V doesn’t work, I’m saying I see a lot of folk with prices that preclude any growth.
Demand is a curve like this, and the optimal price is the one that creates the maximum area in the box.
Revenue = price * qty
Most V4V content creators have prices that create very tall thin boxes with small area. This really caps their revenue potential.
It’s better to charge 1m people $0.05 a month than to charge 500 people $10.00 a month.
Your price point is a huge determinant of your audience size. 
