It would agree that it would be of a benefit if they were supporters, but saying that Qualifications come first aswell as a 'Knack' for the job.
The feild I work in I have seen qualifications coming out of every orriface and they still don't mean poo in the scheme of things.
You can be qualified to look after kids but not necessarily have the knack of the rapore some people have with them. On that note as a career 'nanny' lets say you would I presume do a fantastic job and do everything to care for the kids, but not as much as for your own child.