My feeling is any community needs to constantly look for engagement to keep more than a hardcore group engaged. I used to belong to a few meetup groups, one in particular had an active leader who arranged a variety of great afternoon, day, weekend and even multiday trips. They catered to new and experienced riders - come one, come all. On several occasions, guys with wrenching experience helped other with their bike troubles.
Some were well off riding shiny new bikes, others needed to carry wire, quickstart and duct tape in the panniers of their 20 year old S40s. Everybody had fun - the common interest was getting out for a ride, the glue was the leader.
When the leader passed away a couple of years ago, the group dies with him. I kinda miss that.
Ive been on a few rides with GTAM members, but not many. I'd enjoy more of those -- there are lots of us who post great solo rides, maybe next a thread with a ride calendar would attract a few more into the community.