While I see your point in that you can turn off easy mode and fight tougher things I fully agree with Renta in saying the problem is there is no reward for doing so. If the rewards were greater then I would be all over it. I also fall into the bracket of what is most efficient SP wise mainly because most of our LS are NA players and I live in the UK so when we do leve runs it is usually very late for me so the only reward I get for turning up the stars so mobs are super hard is that I get to bed later and am more tired for work in the morning ^^