it depends really, at least for me. If I have a whole lot of gold not tied up into other things, I might spend some of it for mats depending on the price. Most of the mats I have come from characters, farming, or undercutters in the auction house or people who make mistakes pricing the mats and putting them in the AH (i love that :P).
Remember that each server's economy is different, so his list might not work for your server. But I would spend some gold to make some gold as long as I see at least 5+% profit.
I think it was mentioned. but if you get on WoW on weekends, check the AH for undercutted and/or wrong prices that are lower then usual then snatch them up and sell during the week
Some people like selling during weekdays at prime time for your server, I however like doing that and selling late night on the weekdays. That is when I really jack up the prices of, lets say glyphs, mats, or any other high in demand items. Also look for other markets to dip your feet in, do not stick to one thing like enchanting. If you have many different items that are from different professions or other high demand stuff like low/high level gear, you will bring in more gold per hour.
Another thing is if you are lazy and do not want to put in the effort to learn the AH, addons, and or your servers economy, you will not make the amount of gold you want. It takes awhile to get setup but once setup everything will just fall into place![]()
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