Why am I getting advertisements with a premium account?

@kimojima - Those banners are only on a few courses that have a higher quality audio version available for sale. The audio attached to the course was free and is not as good as a professionally produced audiobook. These give people the option to pay for upgraded audio if they want. The ads are easily ignored I think. We experimented with this for a time to see if there was a demand for this type of professional audiobook but there isn’t so it is not something we have continued to do. We didn’t think it was necessary to remove them.