its important because when you get to higher lvls, its good to farm at lower lvls (main spot = bandit den/stronghold) this is because their spawn rate is very fast and if you have an sos weapon (preferably a bow) you can kill and kill and kill without running out of targets.
in result, the more sp you get from these mobs, the better off youll be in higher lvls so you dont have to sp farm in higher lvls because the spawn rate of mobs in higher lvls arent that great. granted there are a few spots, but is MUCH easier to do sp farming in lower lvls.
and like W3GAN said, you need those gaps to sp farm. though you can have any gap really to sp farm, but if your going to do it at the bandit den ... do a 9 lvl gap. and if your not done sp farming and you lvl up, de level (meaning turn off your auto-pot and just keep dying)
- hope this helps

and good luck!
