Oh, I didn't mean this to be accomplished by live GM's. I said NPC's for a reason. So that they can tirelessly patrol the gathering nodes for said botters.
I believe all of this can be scripted and dealt with by other means than capping the rate at which we can gather to thwart RMT's.
Besides, this adds up to minor annoyances live players must interact with rather than gameplay changes that affect everyone. These are levels at which I would not ever obtain because I would get bored and moved to another job with so much gathering. But I can see it interfering for ppl truely motivated. This isn't fair to them and starts to take the fun out of the game.
Interactive NPC's are more interesting than gathering rate reduction. On the other hand it is more work as well for the developers. For them this is just a stat change in their programming.