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
Yep, but under that scenario you're still better investing the money you pay for a miner directly into bitcoin now, if all you're banking on is BTC value to go up.
In a year's time you'll be left with more BTC (valued at $30k),
You do the math, how much BTC can you buy now for the price of a miner? Will it make that much BTC this year? The answer should be obvious.