I just need to vent.
In order to float rivers you often need a permit. So I got a permit for a desirable river trip, lined up 10 people who claimed they wanted to go rafting, rented enough boats for them all, reserved a group site to camp the day before the launch, shelled out 100s of $$$s for all the permits, rentals and campsites -- and then 6/10 of them dropped out one week before the launch date when it's too late for me to get a refund. So now I also have to try to make people pay up for a trip they didn't go on. Grrrrrrr.
I suspect group size had something to do with your fine experience. 10 is way too much of a herd, and two is barely safe, but four or five is just about ideal. It helps if there are pre-existing social relationships between folks and not just random people, drawn at large.
Glad you had a wonderful trip. Sorry to hear about the issues. i have been there done that (Golf Leagues and a trek at Philmont Scout ranch). Always lots of I would like to do that. Then when the ask for the money occurs, things can get fun.