There is a growing number of search service companies, but it is difficult to determine the quality of these services. The aim of certification is to give a kind of quality assurance (although as with any examination there is no guarantee that all who pass have the desired quality level)
Recognition of profession
it takes time and effort to become an all-round patent information professional and it is a responsible job (missing crucial documents may be disastrous), however, the job is not always valued. The aim of certification is to get recognition of the profession, and thereby maybe make it more attractive.