People who overprice to the extreme. Example, a green level 7 +1 crit crystal (blue band item) for 5k. Who the hell at lvl 7 is going to afford/be stupid enough to buy that?!
This for me along with other kind of stupid pricing a la:
Item X priced @ 10,000 credits
Item X priced @ 9,999 credits
And so on.. i mean honestly, does that ever work? Cos if i need something and just have to use the GTN and checking the prices i see that crap i will always buy the more expensive one as if people honestly think their massive 'discount' draws buyers, eh..