Until 2-3 days ago, the total hashrate went up to 98-99 Peta Hash. Since then, it has calmed down to 86-87 PHs. Cex/ghash responded by ramping up to 41-42 PHs and is currently sitting at 39 PHs. It's a little bit disconcerting because they had been hashing at around 35% for a long time and to see them ramp up to 45% of the total will cause many miners to move to other pools like bitcguild and eligius.
Cex/Ghash had promised that they would never go to 51%; however, they have not kept other promises, such as allowing cloud miners to mine at other than ghash.io pool.
As others have said above, it boggles my mind why anyone would buy GHs at cex, it's overpriced and you are charged outrageous fees and you are giving your hard earned money to crooks, swindlers and inside manipulators at cex. There must be lots of feeble minded people around the world.