I am not sure that is true. If it is true, then they are committing tax fraud since nearly every journal is published by a non-profit foundation or organization.
A NPO just needs to reinvest profits towards whatever its mission is...
I work for a non-profit medical association, and there is every bit as much of a concern about turning a profit on our products, its just where the profits end up that is different.
Heck, we're even getting xmas bonuses. 5% Base salary + $1,000.
Please note that my comment regarding non-profit status is a response to the claim that the purpose of scientific journals "is to make money". If this claim is true, that their purpose is in fact to make money, then they are fraudulently representing themselves to tax authorities when they claim to be non-profit organizations.
I have no direct knowledge of the cost breakdown for organizations that publish journals, but I could see how the journal could be the money maker for the organization that then allowed them to perform other duties (lobbying, education, etc... ).
My only point is that a print publication could still have the purpose of being a "money maker" and the publisher still be a non-profit.