maybe he suffers from the "cardillac-syndrome" and wants to keep his best tracks just for himself
"German psychologists have used the term "Cardillac syndrome" to refer to the pathologic difficulty or inability of an artist to separate himself from his works. In order to live from their creative efforts, artists must be able to separate themselves from their works. Often, however, this is extremely difficult for them, probably because their works represent part of their identity. They deal with this problem by various means, including keeping meticulous lists of those who have acquired their works and ensuring in contracts that they may buy their works back at any time"