I have sold TV commercials for over 20 years.
You would be surprised at how many people buy from TV - it is the most powerful form of advertising around.
It combines sight, sound and movement...
They CAN be overdone (which is why GEICO has so many types of commercials - to prevent burnout).
But it costs a ton on money to reach that point.
TV advertising provides the cash needed to produce the shows you watch (even on pay TV - the costs are too high for subscribers only to underwrite programming)...just like the intrusive ads on FB pay for your free membership.