No doubt they're a section of the Northern Beaches, but I suspect a minority.
And little wonder the majority don't want to avail themselves of what you state is the only thing going for the membership packages.
But you talk of "buses" ie more than 1. Sureley you don't believe that the majority of the supporters have travelled some considerable distance from the outlying suburbs to Brookvale, to get on a bus to take them back from near whence the journey started, returned on said buses all the ay back to Brookvale, which is when you saw them and then relied presumably on public transport to return beyond the boundaries of the Northern Beaches to their places of residence in the Western Suburbs.
You have stated many a fanciful comment within these pages but can you show evidence that the majority of the supporters on these buses are not from the Northern Beaches. Without evidence your comment is no more than another ill informed comment about Manly supporters.