The fact remains, that when you mine, you essentially transform energy (the watts) into information, it's simple physics. Information is energy. Being able to hash at 3.5Kh/s for 10W just doesn't seem right, you're near 100% efficiency. And don't get me wrong, but looking at the pictures of the miner, it doesn't look like much...
If I were you, I'd produce 1000 and run them myself and just dump whatever I mine to make a shit ton of $$$$.
If someone trusted on here confirms that your miner does what you say it does, then I'll be the first to order 10 from you. But until then, this is a scam in my books.
Your argument about selling a money priting machine cheaply is very fine.
But the power argument is in-correct, the Baikal N240 does 240Kh/s at 650W, almost same power per watt...
One is an ASIC, custom made for an algo, the other is not. Unless there is a huge tech / price gap (eg 130nm ASIC vs 7nm FPGA...) an FPGA can not compte against an ASIC on ONE specific algo.