Damages your credibility: If you are a serious business, but your website is crowded with animation, stock photography, and other virtual clutter, you are not sending a professional message.
Make you look out of touch: A website you do not update frequently does more than hurt your SEO. A dated website tells your customers you are behind the technological times, or worse that you do not care enough to keep updated.
Costs you customers: Every time a customer navigates away in frustration – because of broken links, complex forms, or too much navigation – it is unlikely you will see them again. If your competitor offers the same services in an intuitive website design, your loss is their gain.
Read more here: The Real Effects Of Bad Web Design