I haven't really found the time to make any decent contributions lately, but I thought I would just stick with small simple tips that new players might find useful rather than nothing at all.
For some reason in WoW, I'm very lucky when it comes to rare drops. Legendaries, mounts, and especially BoE epic world drops. This is how I've learned to benefit even more from that as well as to practice my flipping skills:
Scenario: You are about to hit level 90 when suddenly a decent 476 ilvl BoE epic drops that is perfect for your class and spec. Sweet! You just got a headstart in the gearing up process.
But, my advice is to have a little bit of patience. Head to the auction house, see what it's market value is (let's say between 12,000 and 17,000 gold). If there are none of it available, or only 1-2 similar ones, put your epic up for something a bit outlandish, 25,000 or 30,000 gold and see if it sells.
If it sells, you just made 30,000 gold that you can most likely use to purchase that same item again about a week later for it's actual market value. That way you effectively gain a new BoE epic to use as well as made a bonus 10,000 gold profit.
Yes it's small change in the big picture, and it requires a bit of patience, but it's worth while just to think about. Getting a luck drop combined with some free gold is bound to make you feel good.