Plain and simple... You have 10,000 gold to start and two professions of your choice. At what point do you farm materials and not process them (how much gold average per hour).
Example:
You can process goods for approximately 2500-3k gold per hour and play the AH and not really have to move/pay attention other than undercutting, or you can farm 4-6k gold per hour in materials.
Would you farm? Or would you process? What number would it take to get you to farm instead of process?