Another reason why marketing is so crucial is that many times there is not much of a difference between the products you can choose, the quality is the same and what you can get out of them is the same too, so the main way to differentiate one brand from another comes from your marketing, and a good marketing campaign can make a product to sell incredibly well, while a bad marketing campaign can send a company on its way to bankruptcy.
Nowadays there is a big problem - too many marketing companies promising to promote your product to the first positions. But often you spend a lot of money on marketing, and the result is zero. Why? How can you check the actions of the hired marketing company? Basically, you can't. You can only hope for their honesty.