Actually I know why ISO standards are not public. Some of the *funding* that pays for the ISO is raised by the sale of standards. I understand that the prices are significant, probably because expecting volume sales is unrealistic and some copying/sharing is inevitable.
Keeping the standards expensive may be in the interest of the large commercial outfits but it is not the only reason. Anything that undermines the sale of standards is obviously is the interests of neither the ISO nor the people that pay people to participate in the process.