Pre 2.3 i pretty much was market owner on small radiant shards, the nether essences and some more. I managed to kill competitors asap by buying out the cheaper ones and keep prices at my level.
However Post 2.3 i see more shards and dusts comming on low prices. Now i got 2 options: i can buy all and keep prices high or wait and study market development.
The increase of shards and dusts is related with the increase of pre TBC instances loot so its possible that the flow of shards and dusts keep comming and i end up only spending money on fighting competitors which automaticly means i just helping competitors.
I just hope i can keep these markets as for it (almost) made me my epic flyer already
Anyway i wander what is the situation on your server?