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Answer:
They Made more money than they spent on slaves, so they payed nothing to slaves.
The government of Sudan has been associated with sponsoring Janjaweed, an Arab militia that has been spreading terror especially in the Darfur region.
The Janjaweed has its origins in the long-running civil war that gripped one of Sudan's neighbors, Chad in 1980. The Sudanese government gave arms and ammunition to Arab - speaking Abbala nomads and enlisted them to act as an armed deterrent against Chadian incursions into Sudan during that time. This group together with another tribe from Chad's border later joined to form the basis of the Janjaweed