In early 2008, the NPD Group revealed sales data showing that, while the Wii's life-to-date attach rate was low, in December 2007, it reached 8.11—higher than the attach rates for the Xbox 360 and PlayStation 3 in that month. The Wii's low overall attach rate could be explained by reference to its rapidly increasing installed base, as financial analysts have pointed to the Xbox 360's high attach rates as indicative of an unhealthy lack of installed base growth, and warned that what actually benefits third-party developers is "quicker adoption of hardware and a rapidly growing installed base on which to sell progressively more game units," which tends to lower the attach rate of a product.