Well, they all agree, but I believe it is applicable only when you gained some trust and figured out your niche. If you just waltz into the market flashing a high price, the market will think you’re either a freak or a fraud.
Also, price per pageview schema may look good to you, but I have my doubts. In the context of the commenting my metric would be not the pageviews, but comments. Why should I pay for a page with high pageviews but no comments?
P.S. Does Disqus allow to tag commenters in say Drip? I’d see every comment as an inbound marketing piece, and look for ways for the hosting site to use that info. Then charging per comment would make more sense, too.
P.P.S. I also believe there should be more alternatives to Disqus. And I wonder why there are no more competitors? Some barrier for entry may be there which we are not aware of (aside of the cost of running a HA cluster).