I've never understood why a cruiser needs to belong to some group or other to enjoy the camaraderie that they speak of so often. We get all of that we want by simply going around an anchorage being friendly to our fellow cruisers. Flying a burgee wouldn't change that very much, so we generally don't.
Ann and I are now lifetime commodores in the SSCA. When we joined many years ago they were a fairly unique source of offshore
cruising info and that was their primary role. Obviously, there are countless alternative sources these days, but SSCA has morphed into a different beast, with all sorts of activities and programs that may be of interest to yotties, especially newcomers... internet
based info, lessons, equipment
reports, community support efforts, local "cruising stations" to help out visitors and so on. We don't have the need for lots of these features, but still retain membership
(free for us old timers) and support their efforts where appropriate. Each cruiser must decide whether they get value for the reasonable fees
... and lots do join.
From what has been posted here, the GLCC is quite a bit dearer and offers a smaller benefit package to members. For the OP, you might investigate the SSCA and see if it is a better fit for you.