I've been listening to a commercial rock station on HD (KSAN fm on HD2), and it doesn't have any ads or announcements. There are silly "you're listening to stat

I've been listening to a commercial rock station on HD (KSAN fm on HD2), and it doesn't have any ads or announcements. There are silly "you're listening to station X and it's awesome" announcements every now and then, but that's about it. Everything else is just music. I have no idea why they don't have any talking or ads, but i don't mind. I suspect it's because this is an offshoot station--there is the normal station, with more mainstream classic rock, talking and ads and then there is this "HD2" station with no ads and different music. I really don't know why they run this station or even how it makes any money, but it's there and it's nice. So, for whatever reason, not all commercial stations have ads.