The importance of entertainment is purely subjective.
Where are you getting lost in that concept?

Advertisers spend so much on advertising, because the products they're advertising make viable returns on that investment.
That's it. There is nothing else to that equation.
Advertisements are not guaranteed to work. If you look at advertising as a whole, you will find the vast majority of it is abject failure.

It was bullshit then, and it's still bullshit now.

You are equating "advertising" with "socially important", while I am explaining to you that advertising, and Hollywood in general, only hold importance in YOUR OWN MIND.

Um, no. That's not what I did.

So, you measure society by the products of Hollywood?

Wait.

Cancel your television, then you can use the money you save for more internets.