GHash is hiding their real power. GHash has MUCH more than 51%, i would say more than 60% !
Do remember,
they can low the rate to 4x% in short time by blocking some of their miners and shutting down their own units ,
they can then also raise back to 60% in seconds by just turnning on all their mine units,
why? because greed is part of human nature, goverments,organisations etc can simply take over GHash and destroy bitcoin!
undestroyable decentralized math-proof-of-stake money system? boom! > 60% double spends, confidences gone, bitcoin end!
The community has already appealed to GHash.io to voluntarily restrict their mining (as did BTCGuild before them) in order to avoid going over 40% and you see what they returned
some might say: Put another way, in 5 months when Ghash is at 100%, we can still have bitcoin, and it can still be working fine as a cryptocurrency
acoindr: No, it can't.
It would work in the technical sense, but not in the currency one. Money is a funny thing. To become a currency, something commonly accepted as having monetary value, requires confidence. This is true of any currency, but is especially of something like fiat paper, only backed by government decree, in contrast to gold which has been valued globally for thousands of years. Bitcoin, which isn't physical or backed by decree, is especially quirky in regards to confidence.
If people perceive the integrity of [bit]coins held as subject to too much risk of losing day to day value, due to double spend risk etc., they will not desire to hold them for longer periods of time, or eventually at all, meaning confidence could be lost in the currency completely.
I suspect people are not so concerned with the GHash situation because they appear to be on 'our side', and disrupting the network would run counter to their self-interest. However, there can be a limit to that threshold of trust.
I also believe people recognize there is a viable fallback in Litecoin, for example, if some short-term issue affects Bitcoin, because it's an entirely separate system. That's something I preached a lot about in the past. I would feel more nervous if there was only Bitcoin in which the community placed all its eggs.
https://bitcointalksearch.org/topic/does-the-bitcoin-community-trust-ghash-655116 Sell all of your Ghash Coins before next $400 - $300 crash
https://bitcointalksearch.org/topic/sell-all-of-your-ghash-coins-before-next-400-300-crash-653086 does the bitcoin community trust GHash ?