Wow.. the self denial is incredible. Yes, enjoy your 4U, 400w hashing monster, lol. Size a fucking refrigerator for 66 GH/s.
Profit per day at 66 GH/s @ 400w = $190
Profit per day at 60 GH/s @ 100w = $174
Hashing monster > vaporware product.
You're talking initial gains. Double or triple the difficulty in your equation and try again..
*Hint* Organofcorti already did all the math for you over a wide range of difficulties over on his blog
*/Hint*It actually isn't that bad for the first little while. Even at 250TH/s (~35M difficulty), the systems are pretty similar.
For instance, at $17.50/
BTC and $0.15/kWh, an Avalon hashing at 66GH/s using 400W would profit $455/30 day month.
At the same conditions, the BFL Single at 60GH/s using 60W would profit $447/30 day month.
Baring a change in stats, it probably won't be until almost all the preorders are out that BFL takes over from Avalon in terms of profitability. Avalon's second batch is still a loser in my eyes if BFL (and Avalon) can ship on time though. Earnings might be close to the same, but the Avalon unit is going to heat up a room and use a lot more space, in addition to costing $200 more. They'll definitely need to rethink their price increase or have some super duper extra features.
I hope they keep their tricks a secret until BFL starts building the PCB's and commits hard money to completing their project.
LOLWUT? You think that building the PCBs is the point in which you put hard money into the project? The cost of all the PCBs for the first batch going to be a lot less than they spend on salaries for a month, it's a drop in the bucket at this point.