I'm offically an AH junky :)

[Gadzooks]

here's one of many tips. And every server is different. My economy is horrid. But i buy Nether Vortex & Primal Nethers & any Primals Low watching people "WTS" normally they undercut the AH severely then I take them and resell them for what I know they will sell at. It takes time and I can tell you the AH prices changes from day to day on my server. I sometimes buy "Nether Votexes" for 200g from those people who can't wait to sell on AH then turn around and resell them for 270g. 70g profit! another thing I look for is... Lets say there are (6) primal fires up in ah. 1st (3) are listed @ 23g, the last 3 are listed @ 30g. Knowing that on my server primal fire sell well, I would buy those 3 primal fire @ 23g then relist for 30g. that's a 21g profit. You boviously need time to scan the AH for deals like this but in the end its worth it. Like I said I devoted 3 weeks just AH'ing and nothing else!

Exactly. It just takes effort, and taking advantage of the mentality of the playerbase. Most people want instant gratification - be it selling or buying. Most players are lazy, and have lots of gold, so if someone undercuts you, yours will sell when the cheaper ones are gone.

If you have 1000g stake money, you can double or triple that in a week, easy, if you research your market.

[Crayonbox]

Well, here's my tip I'll throw in the pot.

Patches.

PATCHES PATCHES PATCHES.

They are the BEST times to gouge people and make a lot of money.

Check the patch notes, when new recipes come out, make sure to clean out the ah of those items before servers go down and put them up for gouged prices. As people log on in the early mornings to get these new things crafted, they will buy your's out.
This goes for patches that release new items as well.

New arena season releases are also good for enchanters and jewelcrafters to peddle their wares on the release day when the masses get new pieces of items that need enchants and gems.

Tuesdays right after patches are also good times as well as arena points update.

[Tdog]

Well, here's my tip I'll throw in the pot.

Patches.

PATCHES PATCHES PATCHES.

They are the BEST times to gouge people and make a lot of money.

Check the patch notes, when new recipes come out, make sure to clean out the ah of those items before servers go down and put them up for gouged prices. As people log on in the early mornings to get these new things crafted, they will buy your's out.
This goes for patches that release new items as well.

New arena season releases are also good for enchanters and jewelcrafters to peddle their wares on the release day when the masses get new pieces of items that need enchants and gems.

Tuesdays right after patches are also good times as well as arena points update.

lawl...I bought up so many Void Crystal for so cheap prior to 2.4 and void shatter. I literally had 2 bank fuls of them. Since I bought VC's for on average 15g a pop (made deals with some guilds and bought them in large bulk) and ended up selling the LPSx2 for about 20-25g a pop. I haven't done a single quest or daily since 2.4 hit and I got more gold than I can even use atm.

[Tdog]

Hell I'll add one in that I don't see up here. This goes along with people being lazy. Most raiders will buy their stuff off the AH at the last second right before raid time. Put your stuff up on the AH about 2 hours prior to when a grand majority of guilds on your server start raiding and you don't need to necessarily be the lowest bidder either. My raid supplies generally all sell out before the night is done.