I don't like mixing my solo rides with organized rides because I know if I were to crash, the medical folk that came to assist me would be associated with the ride. (It wouldn't matter what I said. Word would get to them quickly and their fundamental principal is to do good.) Now if a paid up and registered rider crashes soon after somewhere else on the route, well someone else has to take that call. We're busy. He might not get the service he thought he'd paid for.
If this ride had head counters to ensure all are accounted for and nobody got lost, you are making their work harder (and perhaps less accurate).