if Ghash hits 51% its not gonna be good guys.
The split will cause big chaos and probably negative effects will happen to bitcoin.
It already hit 51% once today. Doesn't seem like they were preparing for an attack. A modified client would need to be used in order to take advantage of having more than 50% of the hashpower against the network. It doesn't seem likely that a big company like them would want to do this to themselves. Atleast that's what some people've been saying.
A panic sell of CEX.io hash would be good for them. They could buy it up low and resell when they "mitigated" the problem again. There are dozens of ways that breaking 51% would work to their advantage. Not saying they are doing this on purpose - draw your own conclusion - but the argument that this only hurts them is not sound.