Let's roughly look at the arithmetic:

At the current Bitcoin difficulty today, now, 200GH/s yields about 0.055 BTC, about $46.

So today that is about $46. Obviously $200 for $46/day is a good deal.

It's hard to take 1Gh/s for $1 as being creditable because if it's wildly profitable, there will be "shipping delays" and everything will be sold on top of that.

Very roughly if the BTC difficulty is increased by a factor of 10 by the time you sell your magic miner, then you are looking at a few dollars per day.

In summary, I really find it hard to believe that the average schlub will be able to make any money, because by the time this device is widely available, the ROI will suck, pretty much like every miner on Ebay.

The most interesting thing about your mining is what it will do the the ROI of the current monster installations. If your 1GH/s per $1 is not scam, I wouldn't be surprised if your competition doesn't try to hire away an engineer or 2.

This is a conundrum that I can never understand, If you miner can be this wildly profitable, you should be able to get investors to build this equipment and form a wildly profitable private mining syndicate.

Cynically, a profitable alt coin biz model these days appears to be to build an advanced miner and then market it when its reached about 70% - 80% of it's useful life to an audience that can't do math.