Since the duty and penalty tax are so high.Will you declare the import amount lower when you import the miner from China? What if the customs notice it, will there be more trouble?
If the tax is high for you, then it means you shouldn't import it. Declaring fake amounts will only give you trouble. You'll lose more than the tax money and risk yourself for a jail sentence. Is the risk of getting a penalty worth saving a few bucks illegally? If you are seriously into this, then you will do something similar when you run your miners because they don't run on water. They consume electricity and it is not cheap neither. If you can cheat your taxes, you can steal electricity too? Why stop there?