In Dead Island 2, the player’s chosen slayer will be fighting off hordes of zombies in the Hell-a apocalypse, but to truly make it out of the city, they will need to make some cash while they do it. Cash is used for things like repairing, upgrading, and level-matching weapons, as well as buying needed supplies, weapons, or blueprints from traders. This allows players to keep their favorite weapons on pace with their character's level.
https://screenrant.com/best-ways-earn-money-fast-dead-island-2/