Blyth, Inc. today said Q3 sales fell 33% to $179.5 million, primarily due to lower sales at ViSalus, which markets supplements, energy drinks and weight management products.   “The overall sales decline year-over-year was largely driven by the lower North American Promoter count at ViSalus versus 2012's third quarter, and, while Promoter count continued to trend downward, we are encouraged by the focused efforts to re-launch North America undertaken by the leadership team,” sa...