how did he make money?
Through organizing a stage show based on the story of his voyage.
Benjamin Morrell
. Within a few days of his arrival he had organised a stage show, entitled "Two Cannibals of the Islands of the South Pacific". 
who was benjamin morrell? American sea captain which african countries did he visit? UNANSWERABLE
wiki:14175194
Benjamin Morrell [SEP] Money-making
When he returned to New York after his profitless fourth voyage, Morrell was heavily in debt and in urgent need of funds. Newspapers showed great interest in the story of the voyage, and Morrell was keen to cash in. Within a few days of his arrival he had organised a stage show, entitled "Two Cannibals of the Islands of the South Pacific". This spectacle, embellished with accounts of the massacre at Carteret Island and other dramatic inclusions, played to large crowds at New York's Rubens Peale museum. In October 1831 Morrell took the show on a tour, which began in Albany on October 10.