Really, really really easy money.
If you want alot of money quick, go to anysafe house that you own. Pause the game and then enter the money code. (x,y,x,x,y, click left thumbstick). You should get $5,000. Save your game. Go to the pause menu then click quit game. Now you are at the main menu. Load your game and repeat as neccesary. I got $150,000 in about 10 mins.
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