New CNBC special probes infomercial industry

A new CNBC special, "As Seen on TV," will give viewers a rare look  inside the $150 billion infomercial industry. The show is scheduled to premiere on April 22 at 9 pm ET. CNBC takes a look at how and why some of TV's most popular products, from the ShamWow to the Snuggie to Ginsu Knives, are flying off the shelves. 

CNBC Sports Business Reporter Darren Rovell tests some of the most popular products to see if they are "busts or buys." He also sits down with "industry heavyweights" to uncover the psychology behind sales pitches. 

For the show's Web site click here.