you cannot mine with normal CPU you need ASIC machines worth 4000$.

on another note:

Bitcoin will never be in a bubble just because of Miners out there..it's like real estate investment: the snow ball rolling becoming bigger and bigger.

my advice:

go to facebook subscribe on some facebook groups about coins mining and ask them theirs advice you will discover the real hardware that you must have. in order to really compete with others and make great profits.

--CopperCoin believer.