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The only people who will buy your crafted engineering items are other engineers (who can always just craft the items themselves), thus you're not going to net much profit.
My assumption is that this is some canned awnser you got form somebody. The truth can be much diffrent than this. Firstly making money with engenering, It helps to be a hordie, Deadly Blunderbuss can be made at a low level, and they are needed for the quest warsong supplies, the reward is a nice blue item,everything else on the quest is farmable, but a engineer has to make the gun, I keep one or two up on the AH at all times, Being a Lock i didnt need mount money, but have been to 60 a few tiems so i know what that my guildies needed some help, i poneyd up 200 gold at level 40, and i would eazly say that that was 300 deadly blunderbuss i sold to get most of that money, 75 silver to one gold, sell like hotcakes, 40 copper and 10 medium leather as well as a few stock items, you can trun a profit even if you buy on the AH for those guys. As you move up the gryrothingy that is needed in the badlands for the Niftystopwatch quest, 50-75 silver, they sell as well as blunderbuss, but even faster, they have low mats, and sell well, my kind of recipe. Scopes, theese always sell starting at accurate+3 I can sell them for 1.75-2 gold a pop.
PvP items
Not all calsses can see far away, like hunters or shaman, and to some extent priest, for the rest, their is the ornate spyglass, them their buggers sell for 1-5 gold, higher when AV is on holliday, folks love it(the spyglass) thier.
EZ-throw and EZ-ThrowII, for BG, i cant get enuff of this stuff for rogues/pallies(on alliance)/mages(you can throw while running, free AoE). Heck I dont care who buys it, but it flys off the shelf.
Hint, some explosives sell A OK to vendors, it has been a while but it is either the iron handgrenade(less likely) or the big iron bomb(i tink thats it)
The final awnser, is if you are looking to make piles of money, drop engineering and take up skinning to go with your mining, but Their is money to be made in the profession, if only becasue of the misinformaion that spred arround that the profession is a "Money Sink". so not untold ritches, but I sure have squeesed a cozy life out of it.