Hi Jeff,
I can speak in terms of GD, as I participate on that panel.
It seems you are driving towards some sort of conflict of interest, and I assure you great pains are taken to not allow this to factor.
Panelists can rate their home courses or any others they play, but with 45 (I think) ratings over 8 years required to qualify for T100 status, one single panelist cannot shift the ratings very much, especially because on a T100 course someone with a supposed slight bias will not deviate more than a point or two in each category, thus not changing the average much among 50+ ballots.
As for supervisors, Ron Whitten has consulted on a couple courses, and has always excluded them (Architects GC in NJ and Erin Hills in WI) from consideration. This has changed slightly as Erin Hills has been added as a candidate because there have been enough modifications that Ron views the course as no longer his own as a whole. This idea is debatable, as EH still has a similar routing as before, but IMO it is one of America's T100 courses today.
I know Golfweek does set up a rater retreat or two for many people to play a course and hear from that course's architect. GD tries not to do this, as the conditions on one day can affect the rating for many people at once. I'm not sure the GW method is wrong, but I agree with the GD perspective. I wish there was a happy medium somehow, but maybe there isn't.
There are no "honorariums" of fees or kickbacks that anyone gets for visiting courses, or promoting such. We as panelistz are allowed to accept comped greens fees, but this is not the point. I have never factored "requiring a greens fee or not" into my ratings, and I have made sure others I know on the panel are on the same page as me. I would guess in my travels, 2/3 of private courses offer comped greens fees, and 1/3 have some fee associated, greens fee or caddie fees...which is well within their right. Usually if I am rating a pubic course, I am paying my way anyways, as this is more seamless than making a request, etc.
Comments?
And thank you Frank for giving a good overall perspective, one that I wholeheartedly share even while being a panelist!