What I find odd (I am a parent governor) is that you are elected by the parent body, but the minute you are you are told that you're 'not a parent representative, you're a representative parent' ie you may have been elected but you are now expected to act as if you hadn't been. Gives a false impression of accountability.
And there is a problem that four parent Govs (which is what we have) can't be said to speak for the 300 strong parent body.
The system of appointing governors is also as weird as it comes, more or less amounting to 'you'd like to be a governor? thank you very much.' If we are going to have governing bodies based on the skills needed, then we need a transparent process of advert, application and interview. No reason you couldn't apply this process in order to fill a set quota of parent governors.
And yes I agree that the numbers of skilled professionals willing to do this for free will be limited. I have a professional job which includes some of the skills needed for the governing body. I serve as a governor because I am committed to my children's school. Apologies for the lack of altruism but I'd be less excited about offering them to the school down the road.
There are issues with the system of school governance, which are more worrying still with a move to academy status on the horizon. I can't think of one which is adequately addressed by ditching parent governors altogether.