NEW YORK (AP) - If Neil Patrick Harris had his way, Britney Spears would be banned from the set of "How I Met Your Mother." Nothing against the pop singer personally - he just doesn't think the show should bring guests aboard for a ratings boost alone."I'm in the minority that our show does not need stunt casting in order to succeed," Harris declared during a break from taping the Monday night CBS sitcom, which has grown a cult following since its 2005 debut."I worry that if they start 'Will and Grace'-ing us too much, that the show will suffer. And we're all really proud of the content of the show. I mean, viewership is not our game. It's the network and the studio's game, you know. It's the promotion department's game," the actor, who plays womanizer Barney, told The Associated Press in an interview last week.Spears has been the most high-profile guest star to visit the set, following past appearances by Mandy Moore, Enrique Iglesias and Heidi Klum. But her capable March 24 cameo - feverishly promoted, anticipated, blogged-about, critiqued, analyzed and, ultimately, well-reviewed - gave Harris pause to voice a concern: Was the show selling out?Source: BadMediaKarma/BritneyExperts