Does advertising really work?
Everyone I know mutes TV ads when they come on.
Everyone I know uses ad-blockers online.
I avoid sites that say 'You can't view this site unless you turn off your ad-blocker.'
And some ads are so annoying &/or repetitive that I refuse to use the product on principle.

@Richard_Littler Advertisers are meant to target average people, not educated ones.

The spy cam pop-unders worked, otherwise they would have stopped quite early, as opposed to browsers having to develop a system that prevents popups.