adStream is a journal of ad-stalking and interesting commercial sightings in online audio services.
We recently spotted a similar tactic in Live365, the aggregating platform for Internet radio stations, which uses banner inventory attached to audio ads to funnel users into subscribing.
“A Word From Our Sponsor” is the banner which heralds an audio spot, and beneath it, “Prefer uninterrupted listening?” That tag leads to a landing page with subscription info for the “VIP” service, which costs $5.95/month if you sign up for a year in advance.
Live365 also uses that tagline embedded in the advertiser’s creative banner, as with this screenshot of a Liberty Mutual ad: