Pandora.com asks more often 'are you still listening?'

In the last time pandora.com asks pretty frequently 'Are you still listening?'. We have the feeling it asks now far more often than just some time go... Did you notice that, too?

What happened to them? Are they afraid they have to pay too much for people, who are not listening? Let's see what will happen in the future. Maybe they'll change it again or make it even worse...?