The man's focus was wrong. He was placing all his energy and effort into acquiring material possessions. We in America are obsessed with money. Covetousness is not practically considered a sin in these times. To look about, one would think a man's life did consist in the abundance of the things he possesses.
Men think they become great just in proportion as they gather wealth.
We must learn to have the proper perspective. Our final priority then can be for our own care. Jesus does not say to avoid possessions, but to put them in their proper perspective. So is he who lays up treasure for himself, and is not rich toward God. The man's focus was on the treasures of this world, and he had neglected the heavenly treasures.