I place the blame squarely on Nexon's shoulders
Even if the volunteers picked were unsuitable for their positions, and did their job poorly or broke NDA, it is ultimately Nexon's fault for not selecting them correctly. I refuse to believe that in the entire community there cannot be found a few dozen people who are capable, responsible, and willing to work to help the game.
With the MWLB, as I said, Nexon failed to properly motivate the volunteers to continue working.
With the MLC, from what I saw, Nexon largely ignored all their suggestions, or at best took from them what looked like it would make money (Oz in Marvel), completely ignoring the spirit of the resolution.
In both cases, Nexon did not allocate resources to interacting with the volunteers and using their contribution. It's not too terribly surprising that people lost their drive, and eventually one (or more) got upset enough to break NDA. (Should not happen, of course, even when frustrated. But see previous paragraph about choosing the right people).
Also, not every attempt fails. The Volunteer Forum Moderator position seems to be working out well, for the most part. I believe this is because Nexon has no choice (they certainly aren't going to hire paid moderators, and the CM is overworked as it is), so they are willing to put in some effort to make it work. But with "mini-GMs" or a "game design advisory council" - well, they already have paid people doing that work, kind of. Higher management doesn't really understand what the player volunteers contribute that makes it worth the extra hassle to interface with them.
How does Nexon manage to find trustworthy employees, then?
How do they manage to find mostly trustworthy VFMs - and get rid of the bad apples without abolishing the entire program?
The people picked for the test server were completely random, so of course there would be plenty of useless or just plain malicious ones there.
But the MWLB and MLC were supposedly hand-picked after a lengthy process, and were still rendered useless and (a few) eventually driven to corruption (or simple carelessness).

Aug
Maplestory Project Newbie
As many of us know, maplestory is easy for characters with link skills, character cards, and even funding over time. But what about the newbies who enter this game?

Sep
MapleStory Mesos and Equipment Drop Rate
I find it very hard to get enough mesos to upgrade my skills (Mastery Books) and Star Force (equipment) by just grinding nowadays.

Dec
Ignoring The Drill Hall Elephant In The Room
one other thing to note, I only made around 14 mill maplestory mesos on average (including sellable drops) every 30 minutes, so in a four hour 2x session that'd only be around 56 million maplestory mesos
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Jul
MapleStory Job Skills Guides(1st - 4th)
Hey guys, welcome to Maplestory2-Mesos, have any of you guys meet problems with job skills, I mean all the job skill from 1st to 4th, it will not take too long time to reach 150, if you use the ways that I'd teach you today

Jun
Maplestory2 Magician Build help
Once you put AP into a stat, you cannot get it back unless you have an AP reset scroll but you'll need to buy it from the 10th Anniversary Coin Shop costing 160 coins.

Jul
Maplestory Beefy's Kitchen Event - Complete coin guide
The pet skills I believe are actually quite fair along with the pets. Some things like the food NX weapon covers have 3 different price points for no apparent reason.