Just FYI, any set of small headphones that you have around (such as for a Walkman, etc.) will work in the jack on the aircraft seat, you don't need to pay if you bring your own, at least when the screens are the collective version. I always carry a spare set of earbuds with me when I fly.
Even with your own 'phones, you do still have to pay when the setup is with PPV individual screens, such as on Frontier, where the individual screens must be activated by the FA or with a CC.