Billy was a well known face, sure other people can pitch, but people grew to trust the things that Billy pitched. you can throw another face in there to pitch Oxi Clean 2.0 but i'll bet it will not sell like it would with Billy doing to commercial. Why you think those inventors wanted Billy to pitch their product? cause thats the best you can do in hope of sales. The Dual Blade cutter brought in 5 million dollars in the first 60 days. that would not have happened if Billy didnt help pitch the commercial.