Interesting topic for discussion I think.
I personally gave up riding in "groups" back in the 1970s. Too many variables, to many agendas.
Disregarding my own judgement I participated a ride last spring. It started out innocently enough; ten bikes from our local classic bike club (guys I've known for years). We were going to take a series of twisty, two-lane, back roads to the Solvang Vintage Motorcycle Museum. Somewhere along the line several other clubs were invited (by someone) to rendezvous with us at two intermediate stops. By the time we were ready to pull out of the gas station there were over fifty motorcycles in the group. I have to imagine how the final sixty mile ride went because I pulled out and headed home.
As the old saying goes, two's company and three's a crowd. Four bikes is my absolute limit. What's yours?