First of all, no they don't. Coaching stipends are not that much. Secondly, you're right. I no longer coach ant sports at all. But neither does the average teacher. Do you know how many coaching jobs there are in a school districts compared to the number of teachers? You act like every teacher has the ability to coach multiple sports, and it should therefore be counted as part of the average salary. You're a clown.
And btw, I work with a guy who coaches 3 sports and has been teaching for about 15 years. Not making 6 figures. Again, this is in Piscataway. Not the highest, but not at all a low paying district by NJ standards.