5k a week is not good, its not good at all, its actually very very bad considering New York is one of the biggest city in the world.
5k a week is 240k per year. An income of about 215k would put you in the top 5% incomes in the United States. Even in NYC or SF you should be able to live comfortably with 240k net income. By no stretch of the imagination is it "very very bad". I guess this board is just full of millionaires.
I'm not saying nobody makes that selling weed because plenty of people do. But I'm inclined not to believe there are plenty of 15 year olds making that kind of money slinging eighths in a small Swedish city. The coke numbers you mentioned are on point though, but coke is a very different business.