If what you are saying is true.then how the hell will we know of any product.
Through marketing a company tries to creat value for their product.
R&D is the engine of any company that want to be competitive in a crowded market.
Safaricom for instance has been successful mostly because of the marketing department and mark you not technical dep.
On the other hand Zain has struggled because of its poor marketing strategy.
So calling marketer liars is a show of ignorace.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3