I'm familiar with the AWS images but at the time I was looking for hosting Amazon charged more for running HVM than for PV images. I can't find anything about that now on their instance types page, so maybe it's no longer an issue.
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Amazon charged more for running HVM than for PV images
The issue was that older instance types (now known as "Previous Generation instances") didn't support HVM for "unix" images, so FreeBSD had to pretend to be Windows -- which meant that you had to pay for a Windows license you weren't using.
All of the instance types introduced since 2010 have supported HVM "unix" instances, and as of a few months ago all of the older instance types have been officially deprecated.
It's no longer an extra charge (partly why I linked to that page which shows the costs).