So because you don't go over 1.25gb you can't understand why someone else would? What if people have different apps or games or uses for the iPhone? Are the apps that you don't use allowed for other people to use in your "line of thinking?" Is someone using their iPhone more not allowed either? I mean, huh? I am not sure why exactly you feel that your use has anything even remotely to do with my own use or anyone elses as I doubt you & I have even remotely the same likes/dislikes/uses/etc...
I use between 5g-7g per month if that and rarely am I ever video streaming on it. I use quite a bit of news apps, maybe some music streaming, MAYBE some Youtube clips, a good bit of email, and some other things. There is nothing in my usage that is "abusing" the system yet I go over the laughable 2gb cap every month. And no, I don't have any strain on my eyes or any other issues. Maybe that is something you deal with and not others.
I still laugh at some who try to pass off their own usage as the way it should be and anyway going over what they did, THEY ARE ABUSING IT! Hey grandma, you watched 2-3 Netflix films? OFF WITH YOUR HEAD!