If you're planning on advertising on either Yahoo, Adwords or Adcenter for hoodia you may need to get a PharmacyChecker ID. In fact, I'm pretty damn sure you need to get one. The only loophole I can see is possibly hoodia will classify as an herb and won't fall under pharmaceuticals. If it does fall under pharmaceuticals you have to fill out an app at PharmacyChecker dot com. That requires a $295 non-refundable fee and $85 per month after that.
That's probably a major turnoff for most affiliates, including myself, and probably the reason you won't get many experience stories, if any.