They are there to make sure the accountants, marketeers, and others who can make money for the company can do their jobs.
How exactly do accountants and marketeers make money for the company? Marketeers arguably have an impact on sales even if they do not make them, and they can be an important differentiating factor in a company. But accountants surely are part of the plumbing, just like IT. And more so than accounting, IT can also be a differentiator even in non-tech firms.