If all you have is second grade math skills you might think ridiculously thin margins are acceptable. We'll be reaching 900 million difficulty in about 6 months, by which point the Jaly will be running not only at a loss, but will not have reached a positive ROI. All BFL products delivered after today will never reach break even.
http://mining.thegenesisblock.com/a/c63ab1d40aI know, for my part, I would not want a device that runs at 200w at 60 GH/s - it would never see a positive ROI.
Now you're talking!!!