i agree with KenanReiz
levelinggear -> almost noone care for buying it and those who care about it usually craft themself
aside from that
some ppl want to buy purple gear for asee teph and also pay good
where you can make good gold is when a new levelcap comes and the maxlevel crafted purple gear is better than the highest reputaton gear, a good amount of ppl will buy your items for CRAZY high prices then
however ou can still try to sell unocommon things, maybe an uncommon buyer will appear
keep in mind: the higher the sellvalue in gold of an item is the higher will be the "auction-fee"