Satellite radio primarily targets people listening

The answer is in their cars.
Research shows thatn about 90% of people who commute in their cars are listening to radio.
This make product marketers design their advertising campaign to target this certain segmentation in order to make their product feel more relevant among the potential customers.

This is primarily for people traveling in cars. Satellite radio is almost strictly a vehicular medium, with stations that are only available through a subscription. The stations are tailored by genre or age group, and feature content as diverse as politics all the way to sports and lifestyle endeavors.

Complementary goods. they go together, thats why one price increase and the others demand increases