Surely, if they could make a breakthrough and come up with an invention, they would become over night millionaires, just from the home miners market. As the big companies are dominating, it's made the target sales from home miners grow. If it was profitable, home miners would be ripping the hands off the inventer!
If someone would design that kind of miner, they would not sell it you or me so I do not see the point of this discussion.
Perfectly said , when a person design like this miner and he certifies that this miner will give break through very soon, then first person will be himself to mine with that design , why will be give to others, if he is giving others then 99% that will be scam not the perfect design.