These sites will be totally attractive to advertisers for one reason: numbers. Their audience is big and growing and their demographic are young males bored with cable and broadcast TV and who are spending more time on the Internet.
There's going to be a small number of people who can do it professionally. These are people who have something unique to say and a big audience. There are definitely going to be superstars. But there are no get-rich schemes.
It's going to be jarring experience the day they turn the ads on. I question whether they should have included ads from the beginning. Now, you're shifting the proposition after the audience has gotten used to an ad-free site.