Some airlines offer free wifi, but the ticket prices are usually higher. There’s definitely a pretty large cost to offer wifi on an airplane. Most of it these days is satellite based, and there are large antennas on top of the airplane in a dome shaped structure. This increases drag requiring a slight increase in fuel burn. Over time that adds up. The prices here do seem high, considering you only get a small amount of bandwidth. The 80MB option can be blown through just by viewing photos.