Tee --

Rush's show was the high-rent district for certain, not all, advertisers because of the size and demographics of his audience.  He spent a lot of money determining both.  He usually mentioned it in the context of audience size, but the demographics were also important.  Advertisers pay extra to target certain demographic groups.  The more precise the identification, the more they will pay.

A You-Tube click doesn't have much identification, so it doesn't pay much.

Take care,

Russ