Untradable equipment - largely Android hearts, but in addition sweetwater equipment, etc.. As someone who makes most of my cash off of kisses and sweetwater, I'd rather be broke and find something else to sell and be able to exchange these around my Maplestory M Mesos account. As of now, these can be the very last thing that I scroll/cube... assuming I ever get around to them! Even being able to sharing tag these items would be better than nothing.
I understand GMS is limited to what it can do, but Spell Traces have to be upgraded to reflect what normal scrolls can do. I don't mind weapons being trapped at 9, so they can make money off Primes with Marvel, but Android hearts should likewise be in a position to have 9 attack! This would not hurt the Prime marketplace, as min/maxers would still want them. As somebody who's probably considered middle class/mid game... These are the biggest glaring flaws to me.
I have played maple for a while, but I still don't know the best way to produce billions of maplestory2 mesos. I've attempted elite supervisors, but they're so annoying to discover and to even acquire maplestory2 items. I need more harm in my wind archer, my damage range is 78000-90000 (level 153}. What's so gosh darn costly and I cant fund my characters worth crap.
I don't spend money buy Maple Mobile Mesos and am considered underfunded, but get around it. There are some really nice MS players out there which will help you also. As for getting mesos, you can sell boss drops and such. I tend to NPC most stuff because of hating the free sector. Just start looking for a few people around and speak to them.