Raleigh later sought to enforce his monopoly on Virginia—based on the potential survival of the Roanoke colonists—when the price of sassafras skyrocketed. He funded a 1602 mission to the Outer Banks, with the stated goal of resuming the search. Led by Samuel Mace, this expedition differed from previous voyages in that Raleigh bought his own ship and guaranteed the sailors' wages so that they would not be distracted by privateering. However, the ship's itinerary and manifest indicate that Raleigh's top priority was harvesting sassafras far south of Croatoan Island. By the time Mace approached Hatteras, bad weather prevented them from lingering in the area. In 1603, Raleigh was implicated in the Main Plot and arrested for treason against King James, effectively ending his Virginia charter.