Song meaning
According to Brett, it could be considered as an anti-drug song. "It works on several levels, like 'how much is enough to kill yourself?'". Greg said it works as a species and as an individual.[1]
Brett: "How Much Is Enough is very literal. How Much Is Enough is about mankind's propensity for consumption and the need for restraint. Perhaps we continue this pattern of mindless consumption then perhaps will be our undoing at the macro level, personally and culturally and nationally and so forth."[2]
References
^ Flipside #59 (Spring 1989)
^ Roger Vulture interview with Brett (1996)