With the upcoming AA/US merger, greater difficulty in earning and utilizing points and airlines status, and growing disparity between coach and first class, there is a room for an in-between class. There is another thread discussing whether frequent flyers care more about being treated special or just having extra room, and it seems many are after more comfort than anything.

So, simple question: How much more would you be willing to pay over what you pay on average for your typical narrow-body 3-3 aircraft to guarantee that the middle seat between two passengers is not filled. Would you pay more? how much more - 25%? 50%? 100%? What if you were also offered free drinks - how much more would you pay then?