Question: Does God want all His children to be materially rich?
Answer: God wants to meet His children's needs. "And my God will supply all your needs according to His riches in glory in Christ Jesus" (Phil. 4:19). Some people can handle riches, while others can't. God is primarily interested in our faithfulness in handling our money, regardless of the amount that we have.
Some things are better than material riches. Consider these verses:
Psalm 37:16 Better is the little of the righteous than the abundance of many wicked.
Proverbs 15:16 Better is a little with the fear of the Lord than great treasure and turmoil with it.
Proverbs 15:17 Better is a dish of vegetables where love is than a fattened ox served with hatred.
Proverbs 16:8 Better is a little with righteousness than great income with injustice.
Proverbs 17:1 Better is a dry morsel and quietness with it than a house full of feasting with strife.
Proverbs 19:1 Better is a poor man who walks in his integrity than he who is perverse in speech and is a fool.
Proverbs 28:6 Better is the poor who walks in his integrity than he who is crooked though he be rich.