I'm making my way through the IEEE annual report to which you linked[a], and am dumbfounded too. Not only does the IEEE spend $193.4M/year operating "periodicals and media," they also spend $103.5M/year on "membership and public imperatives" (!?) and $38.5M/year on "standards" (!?). Note that these figures do not include the amounts spent on conferences, which are at least tangible.
Moreover, it looks like the organization has $523.8M in investments at fair value (p. 43) -- an endowment greater than that of the vast majority of US colleges and universities. Am I imagining things, or does the IEEE look a lot like "a small hedge fund attached to a professional organization?"
To put that last figure in perspective, if income and gains from the IEEE's investment portfolio are, say, at least 5%/year, they could fund all of arXiv.org's annual expenses 20 times over in perpetuity without dipping into capital.
Something smells rotten indeed.
[a] https://www.ieee.org/content/dam/ieee-org/ieee/web/org/corpo...