No, it didn't help her chart success, but the iconic pop culture meltdown of Britney Jean Spears did, indeed, I believe, help her career. I would argue it revitalized her career in terms of interest. Everyone was interested in Britney Spears again. After and during the "In The Zone" era, her career and sales began to taper, even though she was at the top of her game. It was only during and after her breakdown, did her career pick back up. The bigger question is: Was it all worth it?
*cue Madonna's "How High."*
...Vin