Optimization is important for a number of reasons. One would be the usability factor of your website. What happens if a part of the population or the market can’t interact with your product? This is where optimization matters where it handles usability problems with people with impaired visual, audible or tactile abilities. This is a professional thing to do as it will get very much bonus points in the long run, which leads us to point #2.
Professionalism – you want your websites to look and feel professional, and the customers to be assured they are dealing with such a company, individual or product. Keeping with social, industry and other norms is a must here as this is a turning point where the customer or user will agree to continue using your product or will move on to other ideas.
Where optimization comes in crucially is ads. You absolutely don’t want to create a beautiful looking website without anyone to look at it, would you? By optimizing UX, you will get the most coverage for your product and most satisfied customers and ad providers.