In all the areas where there were slaves, today there is a black descendent population. Show me a surviving 'black' population in any of the Arab countries that were receipants of slaves. (Where are they?)
1) Many, if not most, of the males were eunuchs.
2) The Arab slave trade was not necessarily directed toward Arabia as a market, but up and down the Horn of Africa.
IOW, the Arabs were slave TRADERS. Their only CONSUMPTION in slaves was in terms of male eunuchs.