This method is for players who already have a decent amount of cars/possessions, but want to save up for that really expensive car, plane or yacht. You can make a lot of money with this method, but you will need to have at least $1.5 million lying around in your bank account.
The Further Adventures In Finance and Felony DLC gives GTA Online players the option to make money via some nefarious buying and selling ventures, as long as they have some money to start up their business with.
