Hi Susan,
As I was thinking about this, it doesn't seem unreasonable at all. There are numerous parallels in other areas.
One can have accountants certify books- but it means more if the accountant is a CPA. In many circumstances the individual must be a CPA.
ebay could put a line in the which currently says cert/uncert and have it specify cert (
ANA recognized) cert-other
TPG, uncert. A small step, but simple...
Don