You are right the only person that can tell you about a product is someone that has used it before. I came across a post sometime ago of a lady that was part of a group that advertised a relaxer in the early 2000s. The lady said she has never used a relaxer because of its chemical content. So while the ad was encouraging people to use it, they themselves don't use it.

I also heard from someone that has a betting shop that says he will never bet.

Most of these ad companies know what they are doing, they don't really care about the masses they are all out for just themselves and their money