I fly a lot too and that (assuming this is not a joke) seems abnormally low. I agree it is often not worth it though.

Reasons not to use in-flight wifi:

* It might be broken, but the credit card processing for some reason works fine.

* If you are on a short haul flight, it's going to be disconnected for takeoff/landing so you will get a solid 30m

* If you are on an international flight, it often stops work once you are over the ocean.