Search engines are generally not interested in promoting or offer SEO service because they lose revenue from advertising, is held liable when doing a bad job of SEO. SEO does not work for organizations fighting between different marketing power.
Why is SEO Search Engines do not like
Search engines can not immediately accept the SEO services, SEO services because providers can or can tell you directly affect the tracing, you receive a pay per click programs they offer. So there is no official guidance on the SEO. Search engines always give a brief guideline, but never exactly the necessary assistance. Because if they had direct rule can find something similar or crack methods to manipulate the result was still that's the rule book TOC. What is important in the SEO industry performance. As a top site go? How does my site rank at the top?
Why you can not trust their rankings based on SEO
Site owned and managed by the SEO, which is doing good and competitive conditions will rank well, there is still no guarantee that the search engines will do a good job for them. Since I came across a lot of website owners who buy SEO services lose money again to buy another service from another SEO. Some special features of the SEO outside the box thats makes them popular and help them spread the message. This help does not mean that these guys are good to promote their sites, only that they are good in promoting their web sites.
Quality SEO is always expensive and takes more time. However, due to bad SEO SEO market across the field will be tarred with the same brush a few bad people in action. Some companies regularly SEO, PPC, like rum. But one thing always keep in mind that organic SEO, if you are always different from PPC marketing.
The problem with labeling of SEO
The site is important or not, but the main goal of SEO is to ensure that the search engine believes that the site is important. No matter how you're doing SEO work is to improve rankings and traffic. It depends from site to site to site, which methods should be used for advertising. Because there are certain categories that are highly competitive, SEO, SEO is not made to work (I think out of the box), the major search engine like Google, Yahoo or MSN. So in the end it is a SEO service user which way he / she must follow in order to achieve their objectives, to promote your site.
Other problems with SEO
Seo do some stupid stupid stuff that will get your site banned from search engines. This is not the only problem, the SEO industry there are some lazy seo do a good job. Its for sure that your site will get banned if you are not aggressive. Many SEO keywords need to research, loads of effort, and extensive communications building.