Yea, the bags and some of the lower level blues sell, dreamweave for example. I still think a gathering professions are more profitable though. Like today, I farmed in tanaris for about an hour and half and I made 25g off of the iron and solid stones sales alone. Still have 4 stacks of Mithril Bars waiting to be sold at 13g a peice. But really, you can make gold off of anything, save for engineering. Can even play the AH.
Before I quit (right as BC came out) I bought a bunch of black lotuses very cheaply from some farmers, 12g/4. Was really planning on using them for flasks and such, but now they’re selling for 25g pop. But yea, off topic.
My undead priest is currently skinner/miner, but when if I ever level him past 49, I’ll be dropping skinning for engineering. I’m kinda excited 
Btw: I wish you guys were horde on alterac. Being undead with will of the forsaken is pretty much the best thing for pvp. Plus, the undead shadow priest with the undead epic mount = the coolest looking character ever.