Well, first off your going to need a guild who likes you.
Now the fun part.
Make sure there is a fair amount of your guild on and try to have the GM set your guild note to it
What you say is "if anybody has any vendor trash they don't want, Please send it to me. i will take anything Grey-White items etc."
I did this logged of for the night woke up and i had 6 pages of Random grey-white items. Now you take all the items and vendor them off, i made 25 gold doing this. Some of the items were 50-70 trash items which explains the profit.
I reccomend doing this, i have been doing this for about a month or so and i already have enough gold for my 60 mount training.
Feel free to flame.