Grammar and seo are important elements in relation to your site content in the sense that it is important to traffic and therefore back links, people will not share a poorly written article and therefore it will not be as successful if it is fraught with grammatical and spelling errors.
Some seo specialists recommend the use of mis spelled words and terms in the content and articles as "keywords", I do not personally agree with this approach, especially of you have an e-commerce site looking for conversions in terms of sales - having said that there are some products and services that can be quite easily mis spelled in it's everyday usage, in this case I would add the mis spelled word alongside the correctly spelled one with an explanation, this allows you to insert the word whilst showing your clients that you do worry about correct presentation and usage of the words.
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