I started playing the auction house with my jewelcrafter last week, and WOW. I’ve made around 8000 gold in ten days, just buying raw gems, cutting them, and tossing up two at a time of each type. I’ve been using the mobile armory app, so it’s easy to check every few hours if I’ve been undercut and respond. I’ve been neglecting professions for a while now, but I’m also working on my tailoring and enchanting on the same server. I may start working on my inscription toon next. Screw heroics! This is much more profitable.
Of course, what did I do with all that gold? I bought tanking plate for my prot paladin, so I can run heroics with her. :p