Rehab for celebrities?

After writing my last blog I was interested in the whole celebrities going to rehab topic so I was looking articles up and I am amazed by how prevalent rehab is. I found this site that has a summary of some of the celebrities that have been to rehab. It's crazy how many celebrities have gone to rehab! Recently there is Jesse James, Lindsay Lohan, Britney Spears and Robert Downey Jr. just to name a few. The reasons listed vary from alcoholism, cocaine and heroine usage, prescription drug addiction, eating disorders, and sex.

I wonder how much rehab actually helps. There were many who went back to rehab multiple times and some who have had success with it the first time. I guess it just depends on the person. Do celebrities end up in rehab more often than regular people? Or is it just that because they are celebrities we hear about it more?