[WoW] DING!
Just made 65th level. And I have a little over 800 gold, so I'm not looking too bad at being able to afford a flying mount by the time I hit 70. Depending on how much stuff I farm and how well certain other things sell on the AH, I may have enough to just jump to the epic mount.
I am currently not even bothering to make anything in Engineering, considering that it's the red-headed stepchild of professions right now, instead selling any Fel Iron or Adamantite I mine on the AH. I almost have a full stack of Eternium Ore as well... debating whether to sell it as a stack of ore, or wait until I have two stacks, convert it to bars and sell the bars on the AH. The only other stack of Eternium bars I've seen on the AH was listed for over 100 gold. Might be worth it.
Of course, I've only seen one Khorium deposit, and I didn't have the mining skill then to get the ore. Now that I do... of course, no Khorium deposits.
I am currently not even bothering to make anything in Engineering, considering that it's the red-headed stepchild of professions right now, instead selling any Fel Iron or Adamantite I mine on the AH. I almost have a full stack of Eternium Ore as well... debating whether to sell it as a stack of ore, or wait until I have two stacks, convert it to bars and sell the bars on the AH. The only other stack of Eternium bars I've seen on the AH was listed for over 100 gold. Might be worth it.
Of course, I've only seen one Khorium deposit, and I didn't have the mining skill then to get the ore. Now that I do... of course, no Khorium deposits.

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Fie I say!
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I do every quest that I can. If it's a group quest, I try and get a group together or join a group. Most TBC quests pay 3 gold and up, not counting any loot along the way. If I can't any quest item rewards that I get, I sell them. Hell, gray weapons in TBC sell for a couple gold. I've sold quest rewards for anywhere from 4 to 7 gold. (If you know you're not going to use the quest reward, go for plate over any other armor, and two-handed weapons over any other weapons. They sell for the most.)
I sell everything. I routinely run back to Shattrath City to clean out my bags of stuff. There's gray vendor trash that stacks to 20 that sells for a couple gold.
Also, there are certain monsters that naturally drop motes. Voidwalkers will often drop motes of shadow, earth elementals that drop motes of earth, and so on. Collect those, convert them to Primal, and sell them on the AH. I've got 4 or 5 Primal Earth that I'm going to be selling, plus other random mote/primal stuff. If you have mining, make and sell bars. You'll earn a lot of money that way. (Yeah, if you have blacksmithing, you might think you want to skill that up, but it's really not worth it.) I've sold several stacks of Fel Iron bars already, a couple stack of Adamanite, and within the next couple days, I'm probably going to clear another 100 gold off of Eternium bars. And like I said, if I get lucky and start finding some Khorium ore, I'm going to be raking in the cash.
Netherweave. This stuff sells like gang-busters if you price it right. You want huge amounts of it? Kill humanoids. The Fel Orcs in Hellfire Peninsula are good for it, so is the Shadow Council around Auchindoun in Terokkar Forest. Basically, if you find humanoids, kill them. (I get bonus cash, I pickpocket them first.) You can get mad amounts of cash from certain types of mobs, because they also drop faction items. The ogres in Nagrand can drop Obsidian Warbeads which are used for faction with Kurenai and the Consortium. The blood elves in Terokkar drop Firewing Signets and occassionally Arcane Tomes. Both of those are used for Scryer faction. If you want stuff to sell to Aldor-factioned characters, kill Shadow Council for Marks of Kil'jaeden.
Ethereals near Auchindoun also carry nice amounts of cash, and the Nethermancers are grotesquely easy to kill. (You'd think killing them would get you a small amount of faction with the Consortium, but they can't all be winners.)
Finally, only buy things you need. If you're killing plenty of humanoid mobs, you can make your own bandages, and not need to buy any. Same with potions. You don't need to upgrade your armor and weapons every level, and hell, a lot of the quest rewards are going to help you. (Well, if you're a warrior, maybe not so much... a lot of the plate rewards seem more geared for pallies.) Kill monsters for food. (Warp hunters drop warped flesh, which you can make into Warp Burgers. Various buzzards drop buzzard meat which can be made into buzzard bites. You will save tons of cash and improve your survivability a lot with one of those food effects on you.)
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How is roguing post 60 anyway? I know they have an almighty horror of a kill any clothie power at about 68 is it?
I do think engineering needs a good poking though... it has so much promise and then has been left behind. (But then, I'm an alchemist, I shoulda switched to tailoring loooong ago...)
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Anyway, roguing past level 60 is interesting. There are, IMAO, far too many mobs that seem to notice me through stealth, even considering the level difference.
Cloak of Shadows, which is what roughly 104.7% of cloth-wearers are bitching about, comes in at 66th level. And quite frankly, unless they're on a PvP server or do a lot of PvP, the casters have no call to bitch. For shit's sake, it only lasts 5 seconds....
Engineering needs to incarnate into a large, brutal looking man, and kick the devs asses around the block a few times.