Terrible comparison. Best to look at other publishers. To start with, let's look at one with free labor for contributions and review. It costs $45.9 million a year. You might have heard of it:
https://annual.wikimedia.org/2014/#s-6
The next comparison would be finding a firm that does all of Elsevier's services. You start by knowing what they are. They're a part of Relx Group which describes its activities here:
http://www.relx.com/OurBusiness/Pages/Home.aspx
That's a lot. Elsevier itself mainly buys, accepts for free, and hosts research. They might pay reviewers. They also do commercial work for businesses. They also try to make money for shareholders. That always adds up. ;) Here's their annual report.
http://www.relx.com/investorcentre/reports%202007/Documents/...
It has a lot of data but can't directly answer your question. For Elsevier, three things stand out as possibly high-cost items:
1. 17,000 editors reviewing the articles for 2,500 journals. Whoever manages journals plus editors already constitutes large cost.
2. 23% of the revenue is by print sales. A physical print adds real cost to things esp when we're talking big, technical reports and books.
3. There's in-person sales and sale agents for subscription models. Probably lots of sales agents. They'll likely take a commission.
4. The amount of money involved with publicly traded means there's going to be plenty of compliance, management, and executive overhead. On top of nice, executive compensation.
These together would easily make it cost in $100-500mil a year range. Probably more.
EDIT: As gleb said, the Consolidated Income Statement on PDF reader p 98 will tell you in detail what they spend it on. The above activities are common among these types of organizations, though.