I understand that oftentimes persons less qualified than myself improve an article. This has happened to articles I have edited many times. But it is the exception, not the rule. In general, such contributors and such edits make a mess out of my expert contributions; a mess that requires hours of my valuable time (if you doubt it, I can receive $600 an hour for an initial consult) to repair. They should be kept out of my way.
when answering a question do you say "Well I am a doctor and I think this"? Personally, I think that is kind of childish. If your advice doesn't stand on it's own merits then you need to write better answers. Also, if the person you are talking to needs to hear your credentials to take you seriously you probably don't want them taking you seriously.