I heard that we can make much money by mining Bitcoins before, but now we cant anymore. Why?
To be frankly, it's 2018, the competition and difficulty to find even a 0.001 Bitcoin is hundred or even thousand times harder, compare with 2009. Unless, you have over 6 digit of initial capital or you're open up your own mining farm - else, it's better to buy Bitcoin than mining it by yourself~