I made all of my gold from level 10 -> 58 by disenchanting. The enchanting reagents market went totally haywire shortly before I hit Outland. Questing/grinding from 58-70 I made just over 1000g. I arrived in Outland with enough gold to pay for my Expert riding training and class training with 1000g left over, so by the time I hit 70, I had about 2000g on hand. That left me with 1000g after I got my nromal flyer.
A number of people here on Alla suggested I leave Netherstorm and SMV quests alone until I hit 70 so all of the quest reward xp would be converted to gold. I did that, and by the time I left Netherstorm I had made about 2000g (quest rewards, AH drops, vendor trash, etc.) I hit SMV with just over 3000g. Now, I'm sitting at just shy of 3700g having barely touched the SMV quests, with another 300+g on one alt and 50g or so on another.
I got a rare enchanting formula from a random world drop today that has a cross-server median price of just over 1000g, so I'm just going to let it ride on auction with a 1400g bid/no buyout and see what happens. In the meantime, I'll keep plugging away at quests/primal farming/skinning as the mood strikes. If I hit 5200g before the formula sells, so much the better. If the formula sells, I'll have my epic flyer sooner than I thought and I'm sure I'll be able to pick up the enchanting formula at some point further on down the road.
A lot of information I have read has suggested that when you hit 70, make a decision about where you want your gold to go and then stick to it. If you want to load up on crafted/BoE gear for the sake of higher end instances, do that. If you want to save for your Artisan training/epic flyer, do that. If you try to do both simultaneously, you're liable to go insane. It's just too much, especially if you're uncertain about what your options might be to earn gold.
In terms of gear/etc, the only things I've bought since I hit 70 was a Consortium Blaster when I hit Revered with The Consortium (30g) and a couple of limited availability vendor-sold enchanting formulas for a total of 12g. 30g for a 10%+ increase is ranged weapon dps seemed very cheap, and the 12g I invested in the enchanting formulas is just that...an investment. They're something I'll always have that makes my toon more rounded and robust.
I check the AH almost every time I play for significant gear upgrades, but the key word is significant. I'm not about to go dropping 10-60g every couple of days for an extra +2 Agi here and there.
If you put an immediate halt to all spending except for gear repairs, critical consumables (ie. ammunition for Hunters) and flight fees, it becomes very apparent just how fantastically easy it is to earn gold in WoW. What I see happening time and time again, however, is that people earn the gold and then zip right off to the auction house to spend it on junk that they're going to "outgrow" in a week or so.