How could I cook industry like foie gras? I would like to learn the industrial skills that allow them to achieve such successful commercial products like the cheap and addictive foie gras.

I know that in many cases, it is required to have some special machinery.

Customers usually buy it without caring if it is not really foie gras.
Foie Gras is fatty goose or duck liver. There is no machine or process to make it. It is harvested from the animals themselves. Restaurants have providers for their product. You will have to find one for yourself.

I know of no legitimate substitute for Foie Gras that anyone would not care about. People pay a lot of money for Foie Gras and would be quite displeased if they found they were being fed a cheap alternative.

If you are refering to paté made from Foie Gras then you could stretch the final product with the use of chicken livers. I'm uncertain how much cheaper this is though and once again be careful you aren't deceiving anyone.