As I mentioned in the post above, the network hashrate has doubled in the last 2 months, and it is growing even faster now, much faster. So how long do you think an S9 will remain profitable for?
Just do the math!
What if the price of BTC will be $30k be the end of the year? Means the $400 I made from machine this month will be $2k? "Do the math!" lol