Every week, WoW Insider brings you Gold Capped, in which Basil "Euripides" Berntsen aims to show you how to make money on the auction house, and Insider Trader, which is all about professions. For Gold Capped's inside line on making money in game, check in here every Thursday, and email Basil (new address is firstname.lastname@example.org; old one no longer works) with your comments, questions or hate mail!
I've been called a lot of things by a lot of people. The reality is that every time I write about a specific business or tip for making gold, hundreds of people will end up trying it out, and if I write something about one of your favorite (or most profitable) businesses, you may find some of these people competing with you.
The number of people participating in any specific market is going to fluctuate over time naturally, but as I've said before, the people who have the most success are the ones who hang in for the long run. That said, these people tend to have a strange relationship with each other. They're competitors and will undercut vigorously, but they tend to spend less effort on their tenacious competition than one would expect.