Apparently the Old Spice guy was not persuasive enough:
The Old Spice commercials were a viral sensation, and the Old Spice guy is a celebrity. So why did sales of Old Spice body wash actually drop? Maybe because women are letting men buy their own damn body wash?Jezebel
According to industry-watching site WARC, the ubiquitous campaign for Old Spice body wash, "The Man Your Man Could Smell Like" actually corresponded with below-average sales.