Your last comments just made me remember this. My son went to the Vanderbilt prospect camp twice (which was easily the best camp he ever attended). Outside of the Vanderbilt staff, they have 15-20 coaches from other schools that help run it every year. Many have done it 10 years+. They are typically smaller schools. I specifically remember that the Tulane rc was there. I can't find a list of all that attend, but I know that coach was my son's team coach that week. Outside of recruiting, it is a great experience in seeing how a quality program is run. Things are scheduled to the minute, a high bar to put other schools up against.
Other divisions and unpaid assistants can attend D1 college camps to assist. I think scouts can as well.