Coach's Question, Need Help Responding

[PIAA REF]

I have had 2 girls varsity coaches approach me in the past week with the same question. I am not sure how to answere them fully. Let me know if you have any idea how to answer them better than I have already. The question that these 2 coaches brought up was why is it that they see top notch officials not doing Varsity Girls. I replied to them that we as officials are independent contractors. They are upset that they see top officials officiating jr. High games but these same officials will not ref girls games. The one coach even questioned how is that permitted with Title 9. I said since we are independent contractors it has nothing to do with title 9. I am sure they thought as did I that my answer was a little vague. Do you have any better way to answer this. We do have some officials that do only boys varsity, but they may pick up a jr high game here and there because it pays well. These officials refuse to take girls assignments for various reasons. What should I say to these 2 coaches that are offended by such?