I guess I am selfish, but page views == greater advertising monetization of your site. Logical (but not needless) page views such as when a user submits a new post or changes pages (xx posts per thread) result in an opportunity to monetize your site. The online advertising industry does not have a good way to deal with ajax actions (like a page reload) right now, there for excessive AJAX can reduce (without cause) the monetization of your site.