One thing to say mining bitcoin consumes a large amount of electricity and it would take lots of equipment to manned the mining. There should be a development in making the cost of bitcoin lower; given that lower mining cost could yield a higher profit. However, it matters on trading and exchanges.
Everyone knows this already. You must spend a lot of money on super mining computers and electricity for you to mine very well.
Though it is that expensive, miners are choosing that way to earn because it is continuously running and generating more bitcoin even you at asleep. Do not have to work and give all your effort on it and earn huge even the electricity become costly. You can spend a lot on it first but it will stay for you to work in the long run unless it is being damage.