Because it is copyrighted material protected by Hal Leonard. Furthermore, the musicians who transcribed these exercises deserve to be paid. A legitimate PDF costs roughly the same as two fancy coffees ($12–$15). It is the best investment you will make in your playing.
The search volume for the is high for a reason. While the physical spiral-bound book is excellent, the digital PDF version offers unique advantages for the modern musician: Because it is copyrighted material protected by Hal Leonard
