I heard that we can make much money by mining Bitcoins before, but now we cant anymore. Why?
Now it is more difficult to mine bitcoins then earlier, you need much more time. But price is grew up significantly, so when you mine you get more profit. so i dont think the situation changed dramatically.
Yes I think it change. The price of the materials you need in mining is getting more expensive but. When interms of bitcoin i think you can get it back because of the price but i dont think its faster