While it doesn't help now with the prices stabilizing, before you could make an incredible amount of money running shaqs where specific skill discs dropped like cosmos crusher, volcanic carnation, etc. being able to earn upwards of 1 million meseta for a single lvl 15 disc and all lower level ones above 10 selling for a significant amount as well.
Currently some good money makers are keeping an eye open for any units that drop from persona/apprentice/clones, since they're the only source of certain augments which sell for quite a bit, especially with the current event going on making it easy as heck for everyone and their mother to get circuray units.
I do get your frustration though, I wish I had a shot at some of the stuff that were on FUN scratches/mission passes during open beta. But mind you, the economic disparity isn't quite as big as you would think, since a lot of cosmetics shoot up in value by a tremendous amount as soon as the scratch they're in ends, with enough people realizing this and hoarding ones like the pole and chair dances respectively, while people are still looking to make a quick buck off of them.
That and people that played on JP servers already have a good idea of what is going to be valuable, having a frame of reference to compare to, whom are making a killing right now. My friend as one example (who wont buy me gigante legs >=( ).