My cycling group does the same, not least because if we were lined out we wouldn't all be able to talk crap to each other.
Verges are risky around here because they tend to be suppositories for dog poo.
Too many owners only clear it up when they think they may be observed.
Just try to be considerate, that's all. I get the social cycle of cycling I really do. But there's this bug going around and just a little bit of consideration goes a long way. Go on massive group rides for all I care, but don't inconvenience or even worse, put others at risk.
Re verges: if you knew the route, you probably wouldn't even have mentioned this point.
Re dogs: Dogs are to be on leads at all times on this route, by law. I've been using this route about 4 times a week for as long as it's been open, dog poo is not an issue whatsoever, even if it was, it would blend in quite nicely with the typical inch of sheep shoot on part of the most used bit anyway.