What you have to do is play the market with your GHs.  Buy low and sell high just like a stock.  There's usually a mass sell of a couple days before a diff increase so you can sell at whatever it is then pick up more hashing power after the diff increase and keep up somewhat with the increase.

Again, it's an exchange. It's super fluid, and the price definitely varies. I've seen it as low as 0.040 and as high as 0.125 BTC per Gh/S. Hell, I've dumped all my Gh/S into BTC twice and have in no way lost money on the investment. Oh, and ROI? I have every 0.0001 BTC back + mining profits + trading profits. Yeah, lost a lot of money on that one

So long story short: Buy in and sit on CEX shares? Probably a loss. Trade, like a good member of a commodity exchange should? You'll head out on top. If you're smart.  

Cheers, fellows.

It was.  Just about a week ago the high price was only 0.04 BTC, if you had bought it then, you wouldv'e made quite a lot of dollars.