I read about or watched a video of someone who knits inside out and I am inclined to think that if I hadn't paid attention and got in the habit of doing it the other way, I would too. Mostly, I guess, it's just habit. Probably most of the time it wouldn't matter anyhow. Whichever way you knit, inside out or outside out, enjoy. That's what it's all about.
I should never overestimate my basic arithmetic skills.