This kind of scam is common. It looks more like a modified ponzi scheme. I keep telling people that money doesn't come easy. You have to sweat in order to earn it. You can't just send someone money and then go to sleep and expect it to multiply just like that.
Such deals end up with you getting scammed... and please, they are not professional traders but rather scammers.
Yes, you are really right, but every day hundreds of thousands of people learn about making money on the Internet, namely in trading, all scammers live at the expense of such people, in order to avoid this, children need to be taught financial literacy at school and institute.