The danger in being obsessed with material goods is that we become distracted by them and that leads to self absorption. He was missing a great opportunity to solve his problem of the harvest by sharing his goods rather than building a larger silo. If he was focused on trusting God, he would have been able to see that he would be better served by an eternal God than mere possessions.
This encounter gives us a beautiful portrait of the patience and wisdom of the heart of Christ. Sometimes we doubt God's love because He doesn't solve all of our problems all by Himself, right away. But does a truly loving father take the easy way out and spoil his children? No. God seeks the true good of His children, and that can often be different than what we think is good for us. Jesus saw that this man was too attached to material things, and his refusal to resolve the difficulty helps spur the man to reorder his priorities. Let us never lose focus on what really matters in life and that is seeking Communion with God and storing up treasure in Heaven.