'Ointment' in the Bible

It was that Mary who had anointed the Lord with ointment, and wiped his feet with her hair, whose brother, Lazarus, was sick.

Mary, therefore, took a pound of ointment of pure nard, very precious, and anointed the feet of Jesus, and wiped his feet with her hair. The house was filled with the fragrance of the ointment.

"Why wasn't this ointment sold for three hundred denarii, and given to the poor?"