Of course they do this hoping that you'll return the favor by purchasing some of their goods or services. This is just a variation on the previous model. The point of this is that at the end of the chain we are indirectly paying for every bit of subsidized media that we get.
More advertisers are involved, more profit padding is in place, etc.
If Jingo is a network show that has to pump the radio and newspapers full of ads, and that draws you to watch it and it is supported by General Motors, indirectly GM paid for each ad down the chain.