Peace to you OneGod
In your reply you said
Prophet Muhammad could have been the richest man in Arabia, but he wasn't, why? Because he gave up all of his wealth to poor people. Every single thing he earned he gave it to poor people.
Now, in all my reading of the spread of Islam in the years under Muhammed, this wasn't the case. Riches and treasures were stolen, and always one half of all treasures went to Muhammed. I think I have read as well that alms giving was introduced after Muhammed...
The dues rendered by the Mahometan. provinces, and the spoils of war, which streamed from all quarters to Medina, were distributed mainly on these two considerations. Shortly after the Prophet's death, when the tithes came in, Abu Bekr, with his wonted simplicity, called the faithful together, and divided the income equally amongst them all, men, women, and children. In the first year it yielded 9, and in the second year 20, dirhems to each. Under Omar the revenue increased enormously, and he established an Exchequer with a civil list (Dewân).