What about the prices? Differentiated pricing on a per country is an interesting pricing approach, for instance, 1000 infected hosts in Germany are available for $220, and 1000 infected hosts in the U.S go for half the price $110. It doesn't really feel very comfortable knowing someone's bargaining with your bandwidth and clean IP reputation, does it? What's worth discussing is the fact that the service isn't marketed as a DIY DDoS service, but as a simple acccess to a botnet one, where the possibilities for abuse are well known to everyone reading here. Spamming and phishing mailings, hosting and distribution of malware using the rented infrastructure, OSINT through botnets, corporate espionage through botnets, pretty much all the ugly practices you can think of.
If the service was a "rent a botnet" it could have increased its chances of having something to do with Storm Worm's "divide and conquer" approach of segmenting the botnet into smaller ones, since Storm Worm is the biggest inventory of infected hosts currently available online. But since they offer the "on demand" feature, thereby indicating they're surveying the demand for the service itself before putting more efforts into building the inventory, I doubt it's Storm Worm related.