Did The Easybeats suffer from Aussie Syndrome?

i've always been a big fan of 'friday on my mind', well before i knew what the song was called or who performed it.

i've been listening to 'aussie beat that shook the world: the easybeats anthology' today and although they certainly had success internationally, something has always held them back from being spoken of in the same bright and eclectic circles of the beatles, herman's hermits, gerry and the pacemakers and so on.

all five original members were from european families - and there were european tours, recordings in england, residences in england, etc. but they still had to 'return' to australia at the end of it all.

did they suffer from australian syndrome?
or was five years of touring and hard drugs just too much?