from jon bloom's article Jesus wants you to waste your life on the desiring God blog:
Jesus wants you to waste your life like Mary wasted her perfume. For it is no true waste. It is true worship. A poured out life of love for Jesus that counts worldly gain as loss displays how precious he really is. It preaches to a bewildered, disdainful world that Christ is gain and the real waste is gaining the world’s perfumes and losing one’s soul in the process (Matthew 16:26).