Because people to earn without doing anything and they see this kind of scheme as a passive income which is not. The risk of investing in some traders are very high cause there is no guarantee in trading. Sometimes you win, sometimes you lose. Hope people will learn from this mistakes and stop this kind of investing.
The major reason is that they want big money with small work and investment and this is what scammers target. They offer such deals where investors can become rich in short time and this intrigues majority of the naïve investors. Those who are pro investors, they never fall for such scams rather they work on legit projects that demand a real hard work and devotion for the market. Seasonal investors usually get scammed.