Yeah, its frustrating to know that some of the other equipment isn't going to make a dime. But if you download the file and change the network hashrate (left side in yellow) you can guess or even calculate from the current position. This also assumes that the growth of network hashrate is going to consistently increase at the same rate that it has so far. Meaning a total network power of over 9 Petahash by the same time next year.
You can change all sorts of numbers, in the sheet and it will keep calculating, cost of power... etc.. Anyways, just updated the sheet. But its pure speculation on the xCrowd specifications.. Once I have some better info I'll update it. I saved the excel file with the network hashrate of 800, I figure this is probably accurate by October if not a bit higher. So you have to do some changing of the network rate based on when you get the hardware.
Anyways, questions, comments, critiques and donations always welcome!