It's probably saving them thousands of dollars. Even paying for the premium release of Zorin, they're saving software costs, as there are no (or minimal) licensing costs for the server seats, office suite, and other application software.

The vast majority of business users only need basic text and spreadsheet functions. Wordpad provides the first, and any basic spreadsheet program provides the second. For my part, I've never used the more complex functions available in any office suite. Heck, I don't know any spreadsheet users who have used more functions than sum() and count().