And then you as a consumer would have to pay for professional opinions and clinicians. Not for prescription medications, but ordinary products. Bad idea. A better way is to learn about a product through advertisement, and then you can read online reviews to see if the product works as advertised.

Why do you need ads for this? I don't remember the last time I bought something because of an ad. You don't need to pay for professional opinions on everything. I wanted to buy a pair of headphones recently, and so I just scouted the various headphone discussion forums on the internet (head-fi, r/headphones etc) and there was a lot of high quality information and opinions and I was able to make an informed purchase while paying nothing extra. It is very rare that I'm looking for a product and I can't find recommendations this way, and even if that happens I can ask my friends. The best part is that they probably don't gain anything from you buying some product, and that increases my level of confidence on the veracity of their reviews and recommendations.

At this point I've pretty much trained myself to zone out when I see an ad because it is probably peddling some mediocre crap.