Recognizing Gold Farmers
Gold farmers exhibit some certain typical behavior, and the key signs are covered below:
Accounts played Almost Constantly
Look for a character that is played 24/7 (or close to it).
Repetitive Behavior
Look for a character who works the same area, or a limited repertoire of locales, incessantly.
Look for characters who redo an instance indefinitely, regrouping or logging to reset it as necessary. (Blizzard has taken steps to curtail this pattern, so you'll see less of it than you used to.)

Predictable Marketing
Take note of characters who aggressively hawk their wares at the same time of day on the IF trade channel, day in and day out. (For marketing reasons, most farming characters are of the Alliance faction.)
Little or No English
In conjunction with the other indications mentioned here, look for characters who speak little or no English.
Backwards Questing
Look for level 60 characters who are working on low to mid-level quests. (For marketing reasons, Asian farmers play the U.S. servers, so those who know no English at all can't read quest requirements. Thus they can't pursue quest goals until they are lucky enough to find an in-game translator who is willing to help them.)
Don't Remember You
Take note of characters who don't seem to remember knowing you, even though you were grouped with them or chatted with quite recently—a different player may have been operating the character the last time you met.
