What are the odds that God will reward you with success, do you think?
Apparently, God rewarded a lot of slave plantation owners in years past.
Well, that isn't a question about odds. If God has a purpose , he is not frustrated by anything.
Job had buddys that took his failures and troubles as evidence of Gods ire with Job, I doubt not that some American slave owners took their prosperity as evidence that God was pleased with them. This is the same mistake , Gods ultimate purpose in anyones life is not realised in this life, "Why do the wicked prosper?" "Why do bad things happen to good people?" are old questions that are addressed in the books of Job and in Ecclesiastes.
Although God can and will bless some with success and some with frustration he is not obliged to do so contrary to his deeper purposes.
If I need to learn something that only sickness , poverty and humilation will teach me , it is Gods perrogative to bless me with the learning he thinks I need, or use my condition as a lesson to someone elese. From Gods perspective the shaping of caricter is of greater importance than the wealth and power a person might accrue.
Why indeed would God desire that all "his" people be wealthy? What would he get that way?