I personally love to make gold for the sake of making gold :P , but the only point I can see in farming(and which I do sometimes) is that if I am watching tv on the coach and logged in on my laptop, I can passively farm ore and eternals on my rogue who is an engineer. This fills in holes for eternal fires for my taliors and their Spellweave and provides free mats for titanium transmutes.
Otherwise I do not farm anything, I play the auction house a little and use my profession cds to make gold.
There are a lot of really good ideas in this thread for making gold, unfortunately farming is at the bottom of most peoples list due to the time involved.
The final point I think that sometimes gets lost is that there is really no point in talking about how an individual economy is working for a player, the original posters idea would never work on my server, I get a lot of herb and ore auctions back unsold which sometimes can take 3 - 4 posts to finally sell.
For us all we do what works for ourselves and learn from others where we can