Pretty much.
It was more than a few African chiefs that were pissed that the trade stopped in 1807. Even then, they still sold/kidnapped Africans and smuggled them in after. Up to Cudjo Lewis - the subject of
Barrac00n.
GROWING RICH WITH SLAVERY ROYALTY
In the early 18th century, Kings of Dahomey (known today as Benin) became big players in the slave trade, waging a bitter war on their neighbours, resulting in the capture of 10,000, including another important slave trader, the King of Whydah. King Tegbesu made £250,000 a year selling people into slavery in 1750.
King Gezo said in the 1840's he would do anything the British wanted him to do apart from giving up slave trade:
"The slave trade is the ruling principle of my people. It is the source and the glory of their wealth…the mother lulls the child to sleep with notes of triumph over an enemy reduced to slavery…"
In 1807, Britain declared all slave trading illegal. The king of Bonny (in what is now the Nigerian delta) was dismayed at the conclusion of the practice.
"We think this trade must go on. That is the verdict of our oracle and the priests. They say that your country, however great, can never stop a trade ordained by God himself."
Source:
The Story of Africa| BBC World Service
-----
The African role in the slave trade was fully understood and openly acknowledged by many African-Americans even before the Civil War.
For Frederick Douglass, it was an argument against repatriation schemes for the freed slaves. “The savage chiefs of the western coasts of Africa, who for ages have been accustomed to selling their captives into bondage and pocketing the ready cash for them, will not more readily accept our moral and economical ideas than the slave traders of Maryland and Virginia,” he warned. “We are, therefore, less inclined to go to Africa to work against the slave trade than to stay here to work against it.”
Source:
Opinion | How to End the Slavery Blame-Game