What money making method do you use? Is it effective?

[Marvin]

Buying and reselling items is popular, as Marvin said above and can make you the fastest chunks of profit ranging from $10,000 to $30,000 depending on the vehicle etc.

Earned 2 million in 2 weeks <3

I need to try that, are all cars good? I only have about 150k.Also generally I never get any trades when selling.

The cheapeast car I go with is the Aston, but I have multiple vehicles that I dont buy or sell, Simply because they are one hell of a job to resell.

150K is a bit low, however you can start with that, buy a Aston for 105-110K and sell it for 130K