This ,,,could be a reason why.
Wilmot, explained to King Gelele: "England has been doing her utmost to stop the slave trade in this country. Much money has been spent, and many lives sacrificed to obtain this desirable end, but hitherto without success. I have come to ask you to put an end to this traffic and to enter into some treaty with me."
Gelele refused: "If white men came to buy, why should I not sell?" Wilmot asked how much money he needed. "No money will induce me...I am not like the kings of Lagos and Benin. There are only two kings in Africa, Ashanti and Dahomey: I am King of all the Blacks. Nothing will compensate me for the lose of the slave trade."
Gelele also told Burton, "If I cannot sell my captives taken in war, I must kill them, and surely the English would not like that. -King Gelele of Africa