Even at 40 GH/s they are making 1.8BTC a day! Why would they be selling it?! Seems fishy to me.
Do the math, there is more profit in selling the gear than using it.
Actually, I don't think the math supports it. At current difficulty should be about 8K per month.
If it takes them an hour to make a unit and get it out the door its way more profit than mining for an hour. I don't see what a month has to do with it, they don't take that long to build.