Edit: On another note: Why is the free campaign setting not uploaded to Paizo? It might serve as a nice incentive for people in doubt.
Funny you should ask that, The reason we do this is due to RPGnow giving me direct access to people who downlown my free material in the form of their email adress. And with the email address I can email them with future advertising of future and current products. On Paizo, they do not let you do that. Also RPGnow records how many people download it, what else did they downlod when they downloaded it, etc and Paizo doesn't do that. That is the reason we use RPGNow when we release free product; more access to statistical information to help grow my business.