Some people don't think that spelling matters very much, or that a few typos on a page won't hurt. Unfortunately, a document that's littered with spelling errors can damage your reputation, and even keep customers away.
Your website is the public face of your business. It provides a first impression that sticks with a customer, so it needs to be polished. But spelling errors and typographical errors jeopardize that first impression and make you look careless. A customer may assume you just didn't care enough to create a solid website, before you put it online for the world to see. If they come away with the impression that you don't care about your website, how will they think you'll handle their business?
People also associate good spelling with education and social class. A well-written, error-free website makes you or your business look knowledgeable. Even a few errors on your website can make your customers wonder if you really know what you're talking about, or if you really possess the credentials you claim.
Errors also distract a reader and negatively affect their comprehension. A document that's filled with spelling and usage errors may be frustrating to read, or even difficult to understand. You only have so much time to grab a customer's attention, especially online. If it's too much trouble to figure out what you're talking about, your customers will just head off to a competitor's site.
Reading through your website before uploading it may catch some errors, but not all. It's human nature to miss spelling errors in documents you wrote, and even professional editors have stories about embarrassing mistakes that got past them.
Thankfully, WP Spell Check.com's WordPress plugin catches and helps correct spelling errors in your site. Try the free version of the WP Spell Check.com plugin, and focus on your website's content, knowing that the spelling's taken care of.