I think that without any doubts BTC can be a source of income/another question is it stable?Are there any guaranties?
It all depends on your mind and your beliefs in btc as a great method to earn and invest money

ASIC Miners consume huge electricity,so to run this device you will spend a lot on electricity and cooling. If to calculate total expenditure is it profitable anyway? 

Is there any strategy that you know,guys?

I think there is very real possibility of such BTC' value

Bitcoins are an extremely fast-spreading currency. Small businesses aren’t missing out on the action; many small shops have made the switch as well

I first learned about Bitcoin in 2015. I remained skeptical that it would amount to anything but this year I started to really dig in to it

For me the biggest disadvantage is low speed

as if you work for another coins,dude!but bad pr is good pr