or maybe it has something to do with the fact that, assuming a 30% difficulty increase every 10 days, this miner costing 3btc will only generated about 2 btc before it is no longer profitable 
Let me just explain how i came to that conclusion:
the difficulty is currently 1.18 billion
so assuming a 30% difficulty jump every 10 days the difficulty will be 1.535 billion on the 4th when the machine ships
jan. 4th-14th difficulty = 1.535 billion = .6 btc mined (.06 btc per day x 10 days)
jan 15th-25th difficulty = 1.995 billion = .4 btc mined (.04 btc per day x 10 days)
jan 26th-feb 4th difficulty = 2.594 billion = .26 btc mined (.026btc per day x 10 days)
feb 5th-15th difficulty = 3.372 billion = .17 btc mined ( .017 btc per day x 10 days)
feb 16th-26th difficulty = 4.384 billion =.11 btc mined (.011btc per day x 10 days)
feb 27th- march 7th difficulty =5.7 billion =.07 btc mined (.007 btc per day x 10 days)
at which point the miner would start costing more in electricity then its producing if the price stays what it is now.
to sum up:
miner cost 3btc
miner produces 1.6 btc in its lifetime
sorry sushi. went from wildly successful to no longer viable in a week. time to move on to the next thing
(If only I had a time machine: At least I could have instead lost coin to a hardware maker that actually ships 
