" … YouTube shares advertising revenue with content partners, who may be big entertainment companies like Lions Gate or amateur videographers who have developed a following. Hundreds of these partners make more than $100,000 a year. Some, like Sal Khan, a former hedge fund manager who now makes math and science education videos, have quit their day jobs. YouTube’s next challenge is to attract more advertisers by offering more professional, long-form content to supplement the videos of cooing babies and surprised kittens. YouTube is testing a pay-per-view film rental service and broadcasting live events like concerts, and it just signed a deal to show on-demand Major League Baseball games in Japan."