MP is mandatory..you shouldn't be vastly rewarded in all aspects for going higher..that defeats the purpose of them implementing MP in the first place..
nothing to see here...move along.
You got the word wrong. You probably meant "optional" I guess. Other than that, pretty useless post.
I agree that a bit better balancing of MF/GF/EXP gains would help here. Blizzard was clear in their intention to make MP levels optional to avoid everybody going where the grass is greenest I think they were overly cautious because by trying to avoid situation where higher MP levels are considered mandatory in order to get best loot or exp, they achieved completely opposite effect. They made farming/grinding on low MP mandatory as long as you are after loot or exp in the most efficient manner. Challenge on itself as a motivation is only going to last for a while, short one at that.