And ya, saying that MPKing is no big deal is ridiculous.
Let's make a comparison.
Let's say I'm a total asshole. (ya ya big stretch I know

)
Let's say you're a nice guy minding your own business.
You're playing FFXI and you think, hmmm today would be a good day to go and solo some exp in (imagine you're level 60) Garlaige Citadel.
Oh look another Drg is soloing here, /wave Waylander.
Remember you're a nice guy minding your own business, but I'm a self obsessed asswipe who doesn't give a shit about your enjoyment of the game as long as you're not competition for me, so i come along with a beetle while you're fighting another one, I super jump let the wyvern take hate and warp out.
So now you're left low on mp with a fresh beetle and you're probably going to die.
So you lose the 1500xp, lose your food, lose your buffs, lose any one off items you may have active at the time, and worst of all for a Drg you lose your wyvern, if the timer's not up your soloing is over until it is, and then you have to HP back to jeuno and run all the way back.
Now maybe you're some kind of saint and it wouldn't bother you, but I'd be bitching about it for hours.
And it's often the case that peple tend to talk a lot of shit on boards anyway, In all likelyhood you
would be pissed off whether you say it here or not.