My dear friend PRM,
You must be aware that most of the professions, now a days is backed by systematic qualifications and recognised by one or other councils, like MCI, BCI, ICWAI, ICAI, ICSI, DCI, HCI etc. They form and recognise a syllabus that suits the requirement of the demanded services of the business the society etc.
You are stating yourself that one having inadequite formal qualification and at the same time you are also stating he is quite experience. You have to understand that, to deal with a formal authority a person must have a legal stamp, whether he knows the subject or not (unfortunately in all places a formal recognised quailification is first looked into before knowledge).
Yes, if someone considered himself an expert ( I said "himself an expert" because since he does not possessses a formal certificate he can not be said to accepted by others.) he can act as a consultant, but his way would be too tough.
Hope matter clarified.