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...
I remember seeing people saying the Halong miners were a scam, they too showed a bunch of Youtube videos and never sent a review unit out to those that wanted one. I ordered 2 of these, so I will see what happens. If legit, I'm sure they have a few "prototypes" already mining on the CryptonightV7 pools. I'd buy 100 of batch 2 if it works out.
Never mentioned anything about warranty though.