Neither of these are quite right, I work in marketing and spend upward of 10k a month on pay per click ads.You mean don’t click on their ads! The more people who click = less cost per click
A wider/more broad audience usually means cheaper. But it’s all relative, for example pushing ads to directors & rich ppl costs more than students for example. It also depends how much competition there is, they can only show a certain amounts of ads before fb/inta loses ppl’s interest. More competition =more expensive ads.
Cost will even vary based on the brand’s followers/quality. The better your brand the cheaper the ads, as fb wants to serve good ads to their audience.
So really we dont know how much they cost. But by all means click alllll the ads as it costs them. More clicks dont really take the price of them down.
But be aware, clicks arent that expensive, my best guess would be their ads cost them £0.50 a click. (This is a guess, I work in b2b and not fitness)