Lacking good advices on gold- making (markets are too crazy right now... I'm gaining huge amounts of golds both by farming and by crafting, but you already know about the first and the latter is too server-dependent to make for a good post), I want to tell you about a great book that you can even read for free, since it goes under a Creative Commons' licence: FTW by Cory Doctorhow.
For The Win is centered around MMORPGs and takes place a few years from now (nearly in the middle of the book they say: "The last time Ira played a game, it had been World of Warcraft, in the dawn of time"). Most characters are gold farmers (yes, like the ones in China, just without using any bot, since the game has get too smart for bots) and the correct use of gaming slang in a real book is something amazing.
The book is also full of accurate economical notions, presented in a way that really anyone can understand and those notions are also applied to the gaming world (there is nearly a whole a chapter about the value of vanity items in game).
If you're really a gamer, hardcore or casual, you should read this.
You can read the book from here: http://craphound.com/ftw/Cory_Doctorow_-_For_the_Win.htm