BTW to the notion that they will be worthless, bah.
I did the math, it's a little rough but basically on:
At 2 PH, which will take us a year or more (probably much more) to get to just based on manufacturing of the AISC devices,
a 50 GH unit will earn $2.70 per month per $1 of BTC Value.
If 1 PH then double that number
If 500 TH double the previous number
So if BTC is at $100 and you are mining at 50 GH
500 TH = $1080 / month
1 PH = $540 / month
2 PH = $270 / month
If you order now, even though you have to wat you will still likely get it before the total network hash rate reaches, 1 PH. That means you reach your ROI in 5 months.
If BTC Doubles you half that time and if BTC Halves then the time doubles.
My assessments of 2 PH being so far off is based on the fact that Avalon in all three batches might put 100 TH into the market, and BFL looks to be putting about <150 TH based on public acknowledgment of orders in a Google doc, for which I cannot find the link. It was on the BFL forums a while back.
That said the worse case put out by one individual was that there will be 450 TH added every month.
https://forums.butterflylabs.com/bfl-forum-miscellaneous/1459-estimated-future-network-hash-rate.htmlIf that were the case then, the 150 TH of current orders by BFL, let's double that assuming not everyone has posted their order, or even triple it to 450 TH. It should only take BFL to 1 month to deliver all these, yet they claim it will take months. So if it takes months to deliver 450 TH ( say three months ) It will take 1 year to reach 2 PH, but that's if BFL continues to manufacture at break neck speeds.
There are just so many variables, really anything is possible. It is a risk but for those that have taken it thus far, well heck we don't know yet.