http://news.cnet.com/8301-1023_3-57566424-93/youtube-to-try-out-paid-channel-subscriptions-says-adage/
I don't think I'd be all too interested in paying youtube for channels unless those channels included content like an actual television channel. With a setup like this tho, I could see youtube possibly bundling channels together for a monthly price like a cable provider does. Also, if you youtube gets access to a variety of movies and television series, I could see them turning youtube into a kind of netflix service along with their existing user uploaded content.