One thing that you should have whatever you do, is Enchanting. There is always stuff to DE.

Myself i have Enchanting/JC on my main, and recently did 1-450 Alchemy on all 4 slaves. Did this mainly because of transmutes, because its a huge moneymaker. 4xtransmutes (epic gems) each 20 hour, and with transmute mastery usually atleast one slave procs, and gets an extra gem or two. Thats 5-6 epic gems each day, and if i cut them right and put them up raiding days, it's easy 700-800g a day on my server.