I guess this is a good thread to add on to.
I just took one of those post-flight surveys and after the usual series of cabin cleanliness, pilot greeting, etc., I got a new series of questions about the earbuds they sell on board. First question was about priority of comfort vs. quality vs. brand, but then the next few questions were about interest/pricing in DL including a 2-month premium membership to a streaming service along with their earbuds. Options were Amazon Music, Spotify, Pandora, iTunes, and I think a couple others. I didn't think to capture the questions as I was answering them, but IIRC it was are you interested, which service do you prefer, and how much would you pay for this.
Seems like an interesting concept and perhaps tied to the expansion of 2ku (thus more planes with bandwidth to support music streaming, at least). Anyone else get this series of questions (or perhaps something different)?