We all know you spend hours of your free time to 'kill it' in GTA 5; but, how much in-game cash flow do you have? Cause we all know a little bit of cash flow won't get you that far, but, a lot of cash flow in this game will allow you to purchase all the cars, weapons, boats, and planes. It is as simple as 1...2...3.
First of all, don't do any of the Lester Assassinations(except being the first one of Hotel Assassionation, invest in Betta Pharmacuticals and then sell after the mission). Now since we got that out of the way, lets get to the real money—cold hard cash—just like Mr. Wonderful or Kevin O'Leary likes to have it.
The next thing you want to do is after you collect all $25-$60 million(depending on how you did each heist), you now want to start doing the Lester missions. Before you start the next mission, Multi Target Assassination, invest all of your money into Debonaire. After the mission, go back to your house, sleep for a few days, sell your shares, dump all profits into Redwood(while they are at their low) , sleep in-game for a few days, and sell your shares for a MAJOR profit.
Next is the Vice Assassination, purchase Fruit shares before the mission, sleep in-game for a few days, sell shares, and invest all profits into Facade, sleep some more, then sell.
Assassination #4, Bus Assassionation, DO NOT BUY UNTIL AFTER MISSION. Sleep a lot in-game, then sell your Vapid Motor stock.
Lastly, the Contruction Assassionation, this mission(if not invested) will make the difference between about $1 million and $2.5 million. Invest in Goldcoast before the mission, wait 2 days after the mission, and then sell to profit around $900 million-$1 billion.
Now look! You're a billionaire just like the famous, but hated, Devin Weston!