I'm not the AC, but he does have something of a point even if he was a bit rude going about it.
I'd like to think of myself as being quite proficient in Linux. I know my way around the command line well, I use it a lot at work and have a great appreciation for it. I've also used it as something of a hobbyist and tinkering platform at home as well. But the reason I continue to use Windows instead of Linux as my primary platform is simply because it handles virtually all situations that a home user could find a need for. I too don't have much use for video, but if/when the time comes that I find myself needing a video editor, I know there will be many of them available in Windows. Or if I need something special that fills a particular niche, Windows will probably have the software.
The incredibly large userbase of Windows does have its advantages in terms of availability of software and support. It might be annoying in certain areas but this widespread uses has a number of side benefits that shouldn't be easily dismissed I think.
As for the price of software, I no longer buy software and instead just pirate it. I used to buy software, but I realized that over 90% of my movies, music and videos were torrented anyway and there's no chance in hell I'll ever want to willingly delete all that content, so thinking I'm morally correct in buying software whilst pirating media seems so hypocritical, so in the end I just went fully pirate. In this case, the price of pro video editors isn't' a big deal.