It is difficult to understand why a business
would waste time trying to use LO; if a customer uses m$, the supplier
might as well do so also and consider the m$ price as a cost of
I've seen plenty of small, medium and large businesses that chose to use
a free software office suite (so far I've only seen OpenOffice.org, but
the same arguments would hold for LibreOffice).
Virtually none of them did it only to save money, and those who have
this kind of motivations are more likely to go back to Microsoft Office,
so indeed in this case it would be a "waste of time" as you suggest.
But, in almost all cases I've seen, the reasons were different, like
getting rid of dependency on a specific vendor, or being able to run the
same office suite across different operating systems. In these cases,
switching to a free software office suite is not a waste of time, and
compatibility with Microsoft formats is vital.