My income comes from the following combination of characters:
Paladin with Enchanting
Warrior with Blacksmithing & Mining (and Master flying for speed gathering)
Warlock with Jewelcrafting
Druid with Alchemy & Herbalism (and Master flying for speed gathering)
One to two hours of Ore/Herb farming usually brings in anywhere from 10-15k.
Ore gets prospected, blue gems get cut and sold.
Herbs (Heartblossom especially) get transmuted with green gems to make more blue gems that get cut and sold.
Every non-epic BoE gets sent to my paladin for Disenchanting. Maelstroms get shattered and sold. If I have a lot of Essences I make a few vellum and sell them for serious bank.
If the market isn't flooded with Ebonsteel Belt Buckles they are worth making, but you'll probably make more from gems unless you're on a dead server.
With minimal effort (and I do mean minimal... I'm lazy as hell) I pull in 25-30k a week without really trying. I'm fortunate enough to have an unsupervised 3rd shift job so I can farm ore/herbs while making IRL bucks.
TheUndermineJournal.com is a great resource for determining what's most profitable based on your server's demand and availability.