This is just something I've thought up. Dunno if its been posted before, if it has, well, whatever.
Anyway, heres what you do. Go to IF or SW and listen in trade to hear people say "WTB [whatever]"
After you see this happen, escpecially on an item that is rare like a BOE epic or a nice blue, go to a mailbox and send that person a grey item wrapped in a present. In the message say "I heard you were looking for this, so here it is at a reduced price." or something like that
for the price, sell it to them depending on the item. for example, sell a Krol Blade for around 100-150 gold, and something better or worse depending on the item. But always underprice it, so that they will buy it, instead of paying 600 gold for it. They think they are getting a great deal.
btw, this isnt tested, so i have no idea if it will work. and once again, sorry if its been said.
~Orrec