Currently 80% of the total 21 million available bitcoin have been mined to date. What started with small mining operations on individuals’ meager desktop and laptop home computers has since evolved into big business, spearheaded by multi-billion doillar companies.
As mining difficulty continues to increase, it is no longer profitable (or recommended) for bedroom miners to even attempt mining bitcoin on their pcs and macs.
However, as ccn writes, “Hash power or computing power of bitcoin represents the stability of the Bitcoin blockchain network. As the bitcoin network, market, and mining industry mature, bitcoin will evolve into a major currency, store of value, and a medium of exchange.”