Punch received a legal punishment for running away during his period of indenture. Casor served more than the usual term of indenture and was made a slave purely because of Johnson's argument that African slaves should be treated differently. Legal precedent matters.

As for keeping accrued wealth, the descendants of America's richest black slave owner are still rich. See https://www.tampabay.com/archive/1994/10/04/dr-ellison-s-family-secret-is-free-at-last/