All the leading websites and blogs in the world have amazing web design. If your competitors are focusing on their web design, there is no reason for you to not do it. Maybe, your website has much better content than others but people are not reading it because the website is poorly designed. 
Good web design company also helps to build trust. People will trust you more if they find your website attractive. Of course, a company or brand that is putting effort into their web design would also put effort into customer satisfaction. 

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