GTA 5 is far more huge than GTA IV in terms of map size and opportunities.
There are nearly endless possibilities at player's disposal. Therefore, in order to survive in this large and full of opportunities world; you will need big bucks.
More than you thought would suffice in previous GTA(s).
The money will not only let you buy a mansion house, princely cars, and lethal weapons but you will also be able to start your very own business or invest in some else'.
Fortunately, there are a number of ways with which you would be able to get your hands on some big money to fulfill the GTA dream.
I have tried to mention everything I came across while playing the game. Still; don't forget to share your own money-making tips with us in the Comment Section below!