If my friend/family is paid to say good things about a brand, I also wouldn't trust their praise of said brand. I mean, I've had a family member sucked into a product selling pyramid scheme, so I have experienced exactly this scenario.

That is not to say that it doesn't work. The fact that the family member got into the pyramid scheme in the first place is proof that some people are susceptible to it. But also, none of us (the family) gave in to her advertisement, so obviously that's proof that a lot of people also aren't susceptible to it.