How extremely Roman of them. Well, the Roman empire probably was the inspiration of early slavery.
It actually was because Dutch priests kept preaching about the evils of slavery, but it was so profitable.
such a system might make the whole slave trade even worse now that I think of it. The need for fresh slaves would be even greater and thus more displacement of people from africa.
unless a group of former slaves can do it like the Quakers and sue their way to an abolition of slavery (lawsuits are what forced the WIC to enact laws preventing religious persecution)