I totally understand your point Caroline.
But I didn't write the 112th Psalm. The Holy Spirit did. And it's either true or it isn't. I'm not sure how it would be possible for Christians in some of these poor nations could prosper, but I believe if they knew it was God's WILL that they prosper and they believed, they could propser. Now what form that would take I do not know. Maybe it would be a way springing up for them to get out of someplace like Nigeria and be blessed to start a business in a neighboring country (just a thought, I don't really know), but I believe there is a way.
I have heard many testimonies from the very poor hearing the prosperity gospel (the TRUE prosperity gospel, not the bling bling gospel) and rising from very deep poverty to become successful, especially in central and south america.
We are in total agreement that earthly blessings cannot even be compared to spiritual blessins, "I had rather be a doorkeeper in the house of my God, than to dwell in the tents of wickedness!" Psa 84:10
The only thing I have ever asked God for besides salvation of family, etc., is for more of His presence, and more revelation of who He is. To KNOW Him. That is the most blessed you can be. But I just think every Christian should believe for prosperity or how can we hope to help those people in Nigeria or North Korea? If it's in the bible, and it will help you bless others, I think we should seriously consider believing for it so we can be the ANSWER!