'Ask anyone who advertises' - I know what you are trying to say but that is the funniest quote I've read on here. Ask the guy who relies on you believing it works -- he will tell you the truth -- it works!! Haha rock on!
Advertisers don’t sell ads, they buy them.
Ask the company who uses lots of nails whether hammers work.
I mean maybe the purchaser employee at the company has some conflict of interest around the question -- if they're specialized in evaluating and negotiating hammer purchases they'll not want the company to switch to screws.
But the company as a whole seems to have no vested interest in promoting hammers. They presumably want to sell the stuff they make with hammers and may lie to you about how awesome those products are. But lie about hammers? Why?
Just because someone believes it works doesn't mean it does.
Ad companies sell ads.
Advertisers purchase ads.
Users see ads.
That’s it.
Let me see if I can punch through your reading comprehension issues.
Coca-Cola spent over 4 billion dollars in advertising in 2019 [1], I guess if you asked them if they believe in advertisement they will tell you that they do.
Coca-Cola doesn't rely on you *believing* that advertisement work, they *believe* advertisement works.
I do not know if advertisement works personally, I am guessing that Coca-Cola believes it does and that they have reason to believe so.
[1] https://www.statista.com/statistics/286526/coca-cola-advertising-spending-worldwide/