Why a company should adopt LN? First of companies as mentioned 'need BIG Balls', which they surely don't have, so, they won't ever risk doing that.

Secondly if they should, may or may not be. The companies are there to sell their products and take profit. They don't care which way they are paid as long as the rules allow them. If accepting Bitcoin isn't legal tender in your place, the companies refrain from it. If your government or rules of the land start accepting Bitcoin as legal tender, companies would lovingly accept it as currency.