I have literally never heard of any healers running this configuration (except for SCHs with Crit/Acc), and I've played with some of the top healers on my server. You're a healer first and foremost, so stat your gear to reflect that. Yes you should DPS on the side if you have the chance to push DPS, but your primary purpose is healing. Making new healers think they HAVE to DPS no matter what only confuses people and creates issues. But that's a debate for another thread entirely.
Have you played AST? Only when shit hits the fan do I run low on MP, and that's from spamming heals. Yes, I do help push DPS whenever I'm able to. Standing around and doing nothing is unproductive otherwise. If you pop your LA on CD and maybe supplement with a Ewer if you feel you may need it, you shouldn't have to worry all that much about MP. From experience in Savage and Extreme content, my WHM counterparts run out of MP much faster than I do; again, I'm DPSing while healing, and usually so is the WHM. Piety is a waste when you can manage your MP properly and is better suited for a stat than can actually boost the power of your heals.
Won't argue with that. But like I said: I stat my gear purely for healing. I play a healer, not a DPS. I do DPS, and yes, I miss some Malefic IIs or Aeros, but other than that I take up most of the healing so that our SCH can pump out ~600 DPS while trying to keep Combusts/Combust IIs up on things.
Aaaaaand I never said it was. But as the main healer, your main job is to HEAL. If you're constantly worried about your DPS and stat your gear with DPS stats, you should play a DPS, not a healer. The devs have even confirmed that healers should not have to DPS to clear Savage fights unless you are in minimum gear to clear. (Again, I am not saying healers shouldn't DPS.) If you find yourself DPSing enough to get good use out of accuracy, then great. I personally think that stats are better allocated to stats that will boost healing power.