People will always have different opinions, I've voiced mine and Kro yours as well, I don't mean to change anyones mindset just giving my experience/personal play style. Although my opinion personally still stand about why I don't stack MP. Again I would like to point to my original post:

Quote Originally Posted by Nariko Star
-Where is your group at in endgame currently?
-Are you having MP issues a lot of the times?
-Is it because your not regaining MP? Or are DPS/Tank being a sponge?

I think once you can ask yourself a few questions about you and your groups playstyle it will be much more clear what you personally as a CNJ should stack to help your group progress.
Our group doesn't dig into our MP pool currently, If we die- its because our melee were lolly gagging around and el oh el "didn't get a spike down before HF" which although was quite comical to see everyone take a 4k HF it was also was quite a 'wtf' moment.

But if you find yourself having trouble with MP at the time, and you need to stack MP for your group to progress go ahead! Do it. If you find that everyone in your group is fulfilling their roles in the best they can (running out of every eruptions, using Second Wind II, having SS not go down to Seer to avoid Vulcan), maybe your MP pool too, will go practically untouched or you might find MND/Cure Pot a better choice.

I only state this because our group (for the most part) Has every job at 50, and plays with multi-classed abilities so that we can successfully win with ease. If this isn't how a particular group is doing it it's not wrong, but you /may/ need MP to help that group move along.

Find what you need personally to play at your best with the current group you have. I think thats really the only thing that should matter.
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Oh, and to Royal, I've seen Electrum Rings and Tarred Voyager Belts give Healing Hand Potency (members converting them around town), I've tried my personally had at a dozen of each and not had luck. I believe it to be a low % from those pieces of gear, or perhaps I've just gotten quite unlucky.

Happy CNJing all