Take note that search engines frequently make alterations to their algorithms/results which in turn alter the ranking of web sites. An optimizer can add features to an existing site and will be up-to-date on such requirements.
Could you undertake the optimization of your site yourself?
This would require access to your website's code, copius research and time to implement. We all have only a single pair of hands and your own time may be better devoted to existing or other planned business activities.
Would you want to undertake optimization yourself?
There are also things that could be done by the inexperienced that would lead to a ranking penalty or even ban from the search engines. Optimisation is not as straight forward as it may first appear as each search engine needs to be catered for as well as a balanced look & feel to the site maintained for the benefit of your human visitors.
In addition to the benefits already outlined, using a search engine optimizer to optimize your site is far more cost effective than actually hiring an additional employee and more reliable than detailing either yourself or an exisiting employee to undertake the task.
A good optimizer will be clear about what is being done with your site and will work with you to improve your ranking results.
© 2006 Jo Walke