> This doesn't really affect me since I subscribe to premium, but something that a lot of ad-based services don't seem to grasp is why people block ads.

As many services like Hulu, cable TV or even just premium hardware have shown, paying for a service doesn't mean a company will never succumb to the perceived revenue opportunity of showing ads to paying subscribers too. I also pay for premium, but it's very much a case of "Doesn't affect me.. yet"