SEO is a key to the internet/online marketing! What is the point of heaving website that doesn't make any money? You can have the best shop in the world but if it is located in the middle of the desert then nobody will visit it, in the other hand if you have a shop in the middle of some big mall then that will bring a ton of customers and you will start making big bucks. SEO works the same way! You need it to get on the first page of Google!