A caveat - I do not run HT. My club does not put on HT. However, in the Colorado Circuit for FT, the pros are very active in putting on FT. Kenny Trott and Marcy Wright work hard on the Centennial Club trial. Paul Knutson works hard on the Rocky Mountain Trial. Bart Peterson works hard on the West Nebraska trial. And all of them will pitch in on other trials if you ask. In Texas, I know that Eckett, Rorem, and Farmer each have Field trials on their property.
I know that when I judged for the Cape Fear Club, Alan and Gwen Pleasant busted their butts on the trial.
So in the FT game at least, the pros do pitch in. I would hope that HT pros would do the same.