Well, maybe it's easier for you. All I know is that, speaking as an only-occasional reader of manga, it is NOT an easy mental shift for ME to make, and I would rather not suffer through numerous splitting headaches until my brain adjusts. I can appreciate the artforms of other cultures, and enjoy doing so, but when I read something for enjoyment, I would rather ENJOY myself, and not have to strip my mental gears by driving in reverse, as it were. It's the same reason why I prefer watching Bollywood movies with the subtitles on - I COULD spend a lot of time learning Hindi and get a purer understanding of just what's being said, but what's the point when I could spend that time watching Bollywood films and enjoying myself? (Besides, the bad subtitles are fun.) Similarly, if I'm reading a flipped manga and happen to notice that everyone is left-handed (which, by the way, I never HAVE noticed so far), I'd just go 'Whee! I'm in left-handed wonderland!" and keep reading.