One of the companies specifically migrated to avoid MS licensing costs (i.e. moving from Outlook to Chrome for the mail interface, Docs on the web/LibreOffice on the desktop).
The take away? You're always gonna pay. Somehow, somewhere, you're gonna pay. Might as well make sure you're getting a good deal rather than hunt for the free lunch.
I expect Google will find some way to encourage me to upgrade my legacy free Apps account over the next year.
Edit: And I just realized that my Google Plus account is tied to my Google Apps account. If they raise prices on me I'm screwed.
I decided fairly early on to not use my Google Apps account for my Google+ because I figured that in the future I'd want to have the ability to migrate elsewhere without losing all my Google+ stuff...
