Kind of a bourgeois question but whatever. People do actually listen to these radio stations. They will actively seek out radio stations that really do just play the same five or ten rock hits from the seventies, maybe mixed with some modern garbage. Why do they do this? What is going through their minds on the conscious and unconscious levels?
Another way of saying this is that they could play more songs less frequently, but they choose to play less songs more frequently. This increases the common familiarity/overlap that people have, and it makes it easier for dullards to follow along at the same rate, but it makes everything less distinctive, and more competitive.
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