On my mage's server, he is my main, and my enchanter. I prefer having him as my main -- I'll be able to disenchant quest rewards and instance drops as I go (BOP items), instead of vendoring them for a few gold. Sometimes you win some trash cloth blue piece in an instance, nobody wanted it. Maybe they were gloves, or bracers, with bad stats. They might vendor for 2.3 gold, but you can disenchant them to a large prismatic and sell it for 15g.
Also the oppurtunity to get BOP formulas at high levels, rep reward formulas, and of course as a mage its perfect since I can port everywhere. I swear mages make the best enchanters for that reason of porting.
On my warlock, shatt is home out of general convenience. On my mage, I can make my home somewhere else while I quest there (Netherstorm for example), port directly to Org to scan the AH, port back to shatt, all for a few silver. I can sell 1 port for 2g, that basically covers my own personal ports for the next 15 or so..