Lower sales within its ViSalus wellness unit drove Blyth's first quarter results down 25% to $175.7 million. Company executives blamed the first quarter decline on ViSalus's lower level of promoters versus the prior year. Still, the company said it was encouraged by the fact that the March 31st worldwide promoter count marked an increase over year-end by approximately 3%, with both  new European promoters and, more importantly North American promoters, increasing during the first quart...