There are. I am aware of some of them.
I wouldn't be at ease to comment on anything submitted by Professor Mauser today, because I didn't receive it. I don't have the graphs you're referring to or anything else.
There is a very real problem that comes up across the country on a relatively regular basis with questions related to overcharging or undercharging, for all kinds of reasons. Usually it comes down to having put responsibility on the shoulders of perhaps the wrong person.
So yes, there are others. I could try to provide you with some information about them at another time, but I wouldn't be able to speak about them today.