Don't you think you're underestimating a bit the value of a device that just does all of this "out of the box"?
I don't think I am underestimating that because you explained this as a device for "engineers and developers" and that's why the $400 price point doesn't matter. I've been around Bitcoin for years now and I've never seen engineers and developers struggle to build a suitable device (if they don't have one already) and get the Bitcoin software up and running.
I also don't agree with your $125 number.
RPi 2 kit (with case, PSU): $70
128GB sd card: $60
USB miner (optional): $50
Total: $130 without miner, $180 with miner
Net price premium: $220-270
Those are not "best possible prices" either those are just prices I found in 1-2 minutes of searching Amazon.
It seems to me you're really just trying to pick apart anything just for the sake of argument at this point.
I'm being critical yes, but not because I have any agenda against 21. You might recall that I was among those who said their pervasive mining appliance story
might ultimately make a lot of sense. The story
on this product -- as told -- just just doesn't fit together from my perspective at all. It is all based on hype grounded on no real customer value at all from what I can see.