Earlier quoted context omitted.
Nope. Some classes are weighted higher to prevent this.
I don't remember my high school report card having a difficulty rating on the class. I would be very interested in data on the number of high schools that do this weighting.
I forget the max GPA in our class, it was somewhere between 4 and 5, but I don't think it was the theoretical max you could get if you took as many AP classes as possible and got A's in all of them.
Colleges weren't stupid about it, either, though. My brother had a lower GPA since he went to a smaller school with very few AP classes available, but did better relative to that curriculum than I did relevant to mine's, and he got more scholarship offers and quicker admission offers at the schools we both applied to. Even though my SAT was 10 points higher.