No exactly true. Depends on the price of electricity and other factors which are dependent on where you are in the world.
Yes mining is something that you will have to look at everything you will have to loot at the market and you will have to buy the equipment and you will have to manage your time for it same way you will have to pay the electricity bills in mining, so if you have enough amount of capital for all this then you can earn with bitcoin mining, if you see the real face of mining then it is full of profit ad it made a lot of people rich within few months, so buy now to mine but keep the above things in mind.