% orders   num units   unit power   power sold (GHs)
Jalapeno     90%      18000      5      90000
mini single   5%      1000      25      25000
single sc     3%      600      50      30000
mini rig sc   2%      400      1500      600000
total orders   1      20000            745,000



      % orders   num orders   unit power   power sold (GHs)
Jalapeno     40%      16000      5      80000
mini single   30%      12000      25      300000
single sc     25%      10000      50      500000
mini rig sc   5%      2000      1500      3000000
total orders   1      40000            3,880,000




Sales mix is made up - feel free change it. Number of orders is based on the order number tracking I've seen posted around BTF. Assuming 1 unit per order, which is wrong - there are many multi-unit orders, making this a low estimate.

To put this in perspective, the whole BTC network hashing power is currently about 60 PHs.

Based on the estimates above, once all existing BFL units are shipped (if ever) and running, total network hash rate may increase anywhere from roughly 1 PHs to 4PHs. That's anywhere from a 16X to 66X increase in hashing power.

If we extrapolate that to difficulty, we might expect to see difficulty rise 16X-66X, between 130M and 530M.

Is it even possible?  Most of the sellers want BTC only, and refuse to accept PayPal. Are these scams? 

Is there a way to verify that the seller has modified the shipping address, and can not change it later?

Would you buy a BFL pre-order on eBay?

Thanks in advance!