Once you get to grizzly hills the items will normally DE for 5.5 infinite dust or so. I personally have never gotten 5 always 6 or 7. I'm level 78 and i've gotten...

flying (about 1k total)
power lvled enchanting (cost 4.5k)
cold weather flying (5k total)
training (no idea what this costs, i know that to 60 was like 250g per char)
and each char still has 2k

Total of over 20k easy. I forsee getting another 800-1k gold per level till 80 as well. I'd have much more if i was not DEing items. Though infinite dust sells for nearly 2g each on my server so 40 stacks is worth about 1600g and the stacks of GCE sell for 150g per stack or so. It'll end up being about 30k gold worth from questing etc.

i was given no gold and have not used anything other than the quest items and trash drops to get gold. All materials DE'd are in my bank (41 stacks of infinite dust, 7 stacks of GCE)