Celebrities, addiction, and rehab: What gives?

Why does it seem so many celebrities have such a hard time and go to such extremes when it comes to substance abuse and rehab issues? According to the experts, celebrities in general tend to feel protected from life's problems and often have to hit absolute rock bottom before they finally face them. So why do celebrities feel so "protected?" Society catches most of the blame, as experts say celebrities are held less accountable than other people. That, and I think being filthy rich helps too -- they don't have many of same issues the rest of do and in some cases get used to buying their way out of trouble.