AP Photo

Y Combinator is one of the most influential organizations in Silicon Valley. But thanks to the incubator's most recent demo day, it has become a Disneyland for investors, where startups are the attractions that VCs and angels are willing to pay to ride.

On Wednesday, YC graduated 65 startups from its program, its largest class yet. The room was wowed by pitch after pitch from companies like Sonalight, 99dresses, Ark and Socialcam. There were plenty of graphs depicting skyrocketing user growth and revenue, and investors (as they typically do at YC demo day) ate it up.