Why do Recruiters need it?

There are billions of job searches per year. That make up the millions of job searches a month. An awful lot of searches are being made for your services, either by candidates or clients or both.

98% of the recruitment companies' sites we have surveyed are either not optimised or have only a small part of the site indexed. This means that clients and job seekers cannot find the typical recruitment company and end up at a job board or worse still with no relevant sites at all.

So the reason you need SEO is that people who are looking to spend money with you and/or register with you so that you can make money from them can find you first time every time.