Well, apart from what I've already said...
I think the worst part is that LS/DS points are so closely coupled with dialogue and it's not really you that gain influence with them as much as it is them that coerce their influence upon you, since you are basicly sucking up to them, and moves you closer to their uh, alignment or side of the force...but that argument is pretty trite already and closely knitted to non-rpg'ing...like an exploit. "