[goldmab]

While on a 1:1 audio call, users will see content that could spark additional topics of conversation that are relevant to Skype users and highlight unique and local brand experiences. So, you should think of Conversation Ads as a way for Skype to generate fun interactivity between your circle of friends and family and the brands you care about. Ultimately, we believe this will help make Skype a more engaging and useful place to have your conversations each and every day.

How can Skype pretend something is desirable if it goes away automatically when you pay? That's nearly the definition of undesirable.

[anigbrowl]

Because it pays for more people to use the service for free?