Being good at making gold in WoW is more than simply finding a gold tip online and executing it on your server, along with everyone else who read the same article you did. One of the most important traits that will help you get past this is perception -- being able to distill facts and data into patterns that you can use to prepare for similar situations in the future.
I'm not talking specifically about predicting the future, not even trying to capitalize on "copy-paste tradeskill development." I'm talking about something much simpler than that: making money when a patch is released, for example. If you pay attention, you'll notice some things happen every single patch. If you can figure out what they are, you may be able to take advantage of them and make a decent profit.