Here is Thomas Watson’s answer. I think it is a good one:
Consider why the wise God has suffered an inequality in the world. It is for this very reason, because he would have mercy exercised. If all were rich, there were no need of alms, nor could the merciful man could have been so well known.
Are you using the resources God gives you to show mercy? Proverbs 19:17 reminds us: “Whoever is generous to the poor, lends to the LORD, and He will repay him for his deed.”
Source: Thomas Watson, The Beatitudes, p.152