I'm kind of skeptical about this program based on the fact that the single site option ($59/yr) and the multiple medium site option ($550/yr) have the exact same total cap on comments (80,000). There's no additional overhead in processing requests from multiple domains ... so if it's the same account with the same activity cap, what's the point of a ~$500 price jump between the two?

It almost seems to be penalizing people who work with more than one domain. But I might be a bit biased in that regard because I split my personal blog across multiple domains to better segregate, style, and manage categorical content. At the same time, all of my sites are still a single WP network installation with a single instance of Akismet filtering comments ... in this paradigm, I'd be limited to 80,000 comments no matter what, but would I end up paying $59/yr or $550/yr?