Of course there are many retired dancers who would choose to judge and it never happens for them. No matter how available they make themselves. We have many pros that are complaining to the PDF right now (I laughingly call my position, not Vice-President of the PDF, but Director of Complaints Department) who feel that the criteria to become a National Judge is unfair. But I think that is more a matter of numbers than anything else... as ANYONE can register to be a judge. So the roster is quite large. How you set yourself apart from the masses is a lot of effort, and most of the groundwork was laid long before you got your first judging gig.
(One of the suggestions we have received is that National Judges need to have done PRO-AM in multiple styles instead of simply being an Open Finalist in one style. So CLEARLY in the US pro-am is a huge part of the equation. Even Shirley Ballas did pro-am.)
Out of curiosity, what is the specific criteria and groundwork Larinda?