Well, of course, they make money by selling standards, since they sell them.
From your link (2011):
55 % through membership fees
45 % through sales of publications and other income from services
2010: 53/47
2009: 55/45
2008: 60/40
..
2006: 62/38
2005: 65/35
..
2002: 80 % - financed directly
20 % - member body subscriptions and publications income
I think they can operate without paid publications. They could, at least.
Am I reading your link right that they receive 45% of their revenue from selling publications? I don't know many organizations that could stand losing 55% of their revenue.
From your link (2011):
I think they can operate without paid publications. They could, at least.