Plenty of celebrities that have nothing to do with self-help also attract their share of mentally ill folks, so I'm not sure that he's as far out of the norm as you think.

A few folks in my social circles are _very_ minor public figures, more in the vein of "occasionally does a talking head segment on CNN" than "wins an Oscar" and even many of them have had to deal with obsessive attention from the unwell, threats, and people assuming they're rich and begging for money.