with 6,000$ it is super hard to make it at 1 month But Some developers gain it Fast
Yes it's hard you need to be in higher level position in a company just to earn this. And in bitcoin, you must have a lot of source combining, trading, profit in ICOs and other source that you may know. I can't earn this much monthly but yes developers can easily earn this. It's either they are developers of ICO's or they are blockchain developers that has extensive programming skills.
I dont see anyway developers are different from the other people that are into BTC. Yes they make ICOs, but I thought when they create ICOs, people make investments and they return it back after a while. Well, I dont really know how this works cause Im not really into it. Trading can help, but you have to be careful cause youre likely to lose your money also.
It really works for the developers because as the price of their token / alt coin pumped because of the investors that will be possible exit for them if they'll not going to develop the coin anymore. But if the progress of alt coin is good then the developers will be focusing with it. And that's the time they can earn more than their investment to that project.