@Astarae:
It is unfortunate what you have experienced, and I am sure almost everyone has had bad experiences with toxic people in B&S. The forums are filled with stories and examples of it. I have my own experiences too, so I can relate. This game could have a better community, but each individual and the game itself (plus the way it is managed), needs to change to promote a more helpful, supportive environment. All I can say is, improvements can be made.
For what I am addressing, it is only about the regular MOML on HM Jinsoyun/CS 2nd boss Kaari. I believe I first learned what the term was when the orb-user announced it right before using one so that everyone would know, preventing any confusion later. I don't remember having a bad experience while new to those dungeons, and I am grateful for that. The members in your first party there should have been more kind and explained things better, they were at fault for their bad behavior.
However, you are making a big assumption by generalizing most players under the label of being 'conned.' Furthermore, it is a false assumption to say, 'because those players are being conned, they don't want to admit it, so they convince others that MOML is a rule.' I have never been conned out of loot, I willingly share/give it up. Rarely do I ever bid anyway, I usually let everyone else in the party take what they like first. If they really want it because they feel that they need it, and it helps them, great. I am not in a rush to be the very best, and I don't want to waste time/effort in a bidding war. Especially for quick dungeons like HM/CS, I just want to hop in and hop out, then move on to something else.
Also, I have seen a number of MOML leaders being one of the better geared members in parties too, so I don't think it's always the low level players that want all the loot. You keep bringing up the low level players in a bad light, at least acknowledge that there are well-geared players who are doing the same thing. In fact, those low level players could even be whales on their alts doing their dailies. If you want to place blame for the MOML rule, there is no way that it should only go to one particular group of players, it isn't fair at all to see things from only one side.
Your view that the orb-user (in HM and CS 2nd boss Kaari) should not be guaranteed loot is understandable, but it still doesn't change the fact that the quest (for HM) or dynamic quests can't be completed without an orb, and I've been in parties that disbanded because no one had an orb. Everyone would have to go back to F8 to join a party that did. Otherwise, they can't finish their dailies, get event currency, etc. Orbs are not a common item, not everyone has one on hand every day for every character they own. If they were not as rare, I'm sure there never would have been a MOML rule, which I think would have been nice. I prefer that those dungeons not require orbs, but NCSoft has still not changed the requirements. So when someone in my party offers up their orb, I am grateful that I don't need to jump back to F8 to queue again/choose a longer, more tedious quest to finish my daily. It saves me time, at least that is how I see it. I'm not sure how others reason why they agree to MOML, but I don't believe they think that they are getting conned. If they think anything like me, then they realize that orbs are not easy to come by and they appreciate the person who is willing to give up their orb for the party.
Comparing an orb to class skills (resurrection/buff/heal) or charms (resurrection/buff) is unequal. Focus for skills and charms can be acquired/replenished more quickly and easily, even cheaply or for free. It is not the same for orbs. For example, you can't just hit the bosses and immediately get 2 more orbs out of them the same way you can get 2 spheres of focus back to use for a warlock's Restoration Field heal skill. An assassin's Fighting Spirit buff and a summoner's Helping Paw resurrection skill doesn't even cost any focus. You can also get Heroic Friendship Charms and Instant Mass Revival Charms for free from the Daily Challenge Reward Chest - I'm not often in parties where members are constantly dying, so I rarely have to use them and I currently have a good stock of charms. On the contrary, for a full orb, you would need to do daily challenges 6 times to have enough shards, or pay a good amount of gold to buy them all. That is not as fast, easy, or cheap to acquire as focus/charms, which makes it an insufficient comparison. Even with the daily dash now including orbs, you will need RNG luck, which is never dependable. So for myself, if someone has an orb and uses it for the party, I find it kind of them to share, and to be kind back, I will not bid against them on the loot if they want it. Again, I don't really care for the loot, it doesn't seem worth much to me, and I would rather not waste time on a bidding war. However, no one can force you to change your mind if you really want to hold your stance on MOML, I am just sharing my point of view.
Lastly, if what you say is true, in that 'the game will be shutting down in a year or two,' then all the more reason there shouldn't be a rush. Why should people keep putting large amounts of time and money into a game that is shutting down? It doesn't make sense to invest so much into something that is temporary and intangible. There wouldn't be anything to show for it once it's all over. Even if someone were able to reach max-gear the day right before B&S closed, then what? And would they really be satisfied in their life over that achievement? Perhaps they could be satisfied, but it would still not last long. At least for me, I'd rather place my investments in something more permanent. Again, it is clear we have differing views, so you can think and do what you want with B&S, I am just sharing my own thoughts.