It has been my experience that there are quite a few factors that affect this. Server population, PvE vs PvP realm, even down to the day of the week.

Perfect example: My hunter had made some Frosthide Leg Armor to skill up his LW. I posted 2 of them on the AH on a Monday, placing them for 24 hours so as not to waste time on the AH during "maintenance". Both sold for just under the average listed price of 163g. Friday afternoon, hoping to catch the "casual weekend crowd", I posted 2 more, on a 48 hour auction. Both of those sold for 255g each.

Pick a server you enjoy. Server transfers aren't cheap if you decide you don't like the place.


If you are just looking for a server where you can farm mats and be guaranteed of selling them quickly.... I believe Shodokan plays on Illidan