New Expansion Money
There is always money to be made in a new expansion. Especially right at the beginning when you have people power leveling their professions. You can make thousands and thousands of gold off of gathered materials.
Usually this dies down a bit. Then it seems like prices tank. Remember that the market goes in cycles. It is up and down all of the time.
Ore goes up, Ore goes down. Same with herbs and other materials.
One thing I have noticed is that superior quality gems seem to be very cheap at the moment. This probably has something to do with the sheer number of Jewelcrafters leveling their profession. My guess is that the market will go back up when all of the AH dumping JCers are maxed.
You get tons of people leveling a profession with the idea of getting it to the max level for whatever goodies it brings. There are many less that are actually in it for the money. Once the market clears out a bit, you will find the true worth of items.
I am still going to ole reliable. Inscription. I have often times found very cheap herbs on the AH. I turn these into glyphs and make a very tidy profit. Everyone was saying that this expansion would kill inscription because of the added slots. Not true at all. I have been making as much gold as I ever did outside of my days of posting 1000 plus glyphs. I usually have no more than 200 up at a time and make several thousand a day.
Making money off of professions is not for everyone. A lot of people just do it for a little bit of extra cash. For some it is a WoW lifestyle.
Speaking of Jewelcrafting, I made some nice gold off of a few blue items I made randomly. I sold two rings for around 600 gold each.