When you receive a visitor to your site, they will instantly perceive the quality of your services or products. The first impression a customer or potential customer gets depends on the appearance of your website. A visitor will be interested and explore your site if it is appealing and easy to navigate. You are marketing yourself and your business to the world over the Internet and it is important to show your best.
Statistically, if a customer was not impressed with your site or had a hard time browsing it, he/she will exit your site, never come back again, and never recommend your site to anyone else.