ShamWow Vince (Among Other Things)
Vince wasn't really "supposed" to become a celebrity, but by proxy, he kind of accidentally became one. Vince Offer (yes that is his real name) got his career started as a comedian and a writer, but he started acting as a way to pay the bills. Acting turned into commercial gigs, and Vince took the opportunity to start doing infomercials because they were a bit longer than standard commercials.
Smarter Than You'd Think
Not only did Vince star in all of his commercials, but he also wrote and directed them. Seriously, every single infomercial that he's been in, he wrote. That might be the treatment that you'd expect when you're someone who collects $2 million from doing the ShamWow commercial.