Except you’re on a literal plane flying through the sky. This isn’t the same as being on the ground with permanent cables attached to your internet connection. Not only is this incredible that you’d get internet at all, it’s totally reasonable for it to cost a lot more!
Assuming there are 300 people on a flight and half of them purchase this, that would be $4-6000 per trip for internet access. What do you think the actual margins on this access are, especially relative to the other eye watering and obscene surcharges airlines impose?
Times have changed, with Starlink the cost is going to be a rounding error. Free high speed Wifi will probably be available on long haul flights within the next 3-5 years.