I disagree and I think that you're missing the point. Am I quibbling over $20 bucks, yeah, I am. On the other hand, if I purchased a license from MS for Server 2012, Windows 8 or 8.1, and realized that I didn't want that particular OS or my hardware wouldn't support it, I'm totally within my rights to downgrade that license to Server 2008, Windows 7, etc. If you want to take it a step further down, I can purchase a subscription to Office 365 and downgrade that to Office 2013 the same way.
What I'm irritated at is the fact that there's a new version of the software that ONLY runs on the OS that was upgraded to the latest version for FREE and the only recourse I have is to spend more capital for the same software in essence. And the response, or lack of, so far has been, "Whoops, so sorry." You want to say that I didn't read the fine print, you must be an attorney, because WHO really reads the fine print. Especially when I have over 800 students and 150 staff that I have to support at the same time. Sure, I have the time to whip out the magnifying glass and hunker down in the library for a couple of hours to read all the fine print.
So to recap, its not about the $20 bucks, its about providing service to your customers, which sadly, I'm seeing less and less of these days. Now, if you'll excuse my I have to go yell at these ****** kids in my yard.....