In the Show Arrow Oliver Queen is a rich playboy who his family owns a large company called Queen Enterprises. He left on a ship trip one day with his gf sister and his father and got lost at sea. During 5 years he developed fighting skills beyond his believe and learned how to master the bow and arrow. After his 5 year jorney was over he came back to Starling City as a vigilante called arrow with a mission to get rid of all thoose who failed the city with names on a book his father left for him. The reason he was able to take vengeance upon his own hands and fight crime during the night was because he did not have to worried about money, bills, or any of the necessities that the common person would. All he had was to worry about him self and the names in his book his father left for him. Money really did play a major factor in his role as a super hereo because he had all the resources that money could buy. He had his own arrow cave under his sister night club that they owned along with the best equipment and  technology along with the most qualified girl to operate the equipment. He had some of the best arrows in his kind that are impossible to make and a good team that had to be in a budget in order for them to stay. The reason why he could be a viglante full time was simply because he had all the money he could want to make his crusade.