They don't want you to make money in game, they want you to buy money with your credit card and only play a few hours a week.
Nah if that was true then CoF would be the first to go. The Currency Exchange is a closed system and A-Net needs a constant flow of gold into it to entice rich players to convert gems to gold. If there's a gold shortage in game then fewer players will be converting gold to gems and at a lower exchange rate. Theoretically, it could be argued that a greater abundance of gold in game will be more profitable for A-Net as it drives up the exchange rate and makes trading for gold more appealing. Yes, there are other market forces to be considered but in general your assertion doesn’t account for how the system works.
From what I've observed, A-Net seems to nerf events that encourage standing in place and spamming skill 1 to farm. I don't necesarily agree with this approach and I really enjoyed farming CS before all the nerfs.