I took my Paladin through to 90 purely by questing, no dungeons, no Auction House activities & no battlegrounds. You can see from the screenshot below, over 7 days, she earned almost 6000 gold. What the screenshot doesn't show is how much good stuff she picked up! Ignore the outgoings - I nabbed flying & the yak mounts as soon as I dinged!
|addon used here is Auditor|
All that leather meant that I managed to level my profession to 600 without having to spend any gold at all & I still have leather left over too. It's difficult to quantify just how much all this stuff is worth though but at a rough guess, I'd say about 1000 gold for the leather, 550 gold for the Prismatic Scales & if I use the average Golden Lotus price to value my Spirits of Harmony, then around 4000 gold for those.
That makes around 10,500 gold over the process of leveling just 5 levels - not too shabby at all!
I'm just about to start leveling my next alt so I'll try to keep better records this time! I don't cook on most of my alts so it will be easier to keep track on those materials. I've not decided which alt is next though - my heart says go with DK or Hunter as they are both fairly well geared & shouldn't be too difficult. My brain says if I don't level my rogue or priest soon, it will take me 2 years to move them along & my inner goblin says 'get those damn professions leveled as cheaply as possible' which means probably my recently dinged 85 Warrior miner/blacksmith but she's another melee. oh well, I shall ponder it a while longer & let you know next time.
Happy Goldmaking peeps