I also just don't understand how it's profitable to run those ads in the US, given how niche some of the conditions are...like I'm pretty sure that if you have

I also just don't understand how it's profitable to run those ads in the US, given how niche some of the conditions are...like I'm pretty sure that if you have cancer, you're going to be asking your doctor about a lot of things anyway. What's the point of advertising cancer / lupus / drugs that extremely specific conditions that <0.1% of the US population have?