I farm the Hulking Stone Elementals outside of Ascalon City in HM. Per run, after selling the obvious merch trash, I get around 1k in less than 15 minutes, plus Granite Slabs (usually around 30 per run), Scorched Lodestones (around 10 per run, which adds another 10 Slabs when you salvage, or 30g if you sell), and anything else from Purples, Golds, Dyes, UW Scrolls, Warrior Tomes, and from Flint Touchstone and Cobble Poundstone the occasional Elite War/Ele Tome.
The earlier post was right, the first run is usually crap. Afterwards, you start getting decent stuff, but nothing extraordinary, unless you get great golds or Elite Tomes.
I'm not sure how the anti-farming coding in the game works, but if I start getting crap drops, I just zone out to another area, usually Augury, and farm Hydra.
If all else fails, I jump to ToA and advert as a Terror Tank and just take punishment for a bit for a UW clear run. After this is done, jump back to either Ascalon City or Sardelac and start on the Elementals again.
Patience is the key. Compared to other games out there, GW has a very very limited spectrum of items that one can acquire. Honestly. Think about it. How many other games have higher HP/Energy/Damage/variety of Crafting Mats/etc.? Many. If you are getting impatient, because you just HAVE to have that stuff, you might be pushing too hard to get something - so hard that you ignore the obvious.
If absolutely nothing else is there for you to do in the game, you might be getting burned out. I'll admit, my main toon is a Warrior, and it really, really gets to me that it seems like this class has been hit with the Nerfstick (or rather, a full league of baseball players armed with Nerfsticks just ran a train on the Warriors) so many times that it is simply out-gunned and out-classed by all the other profs. Whether this is the Nerfstick pwning my Warrior, or acting as a magic wand to introduce new spawns/mobs to an area (Drok's runs, how I miss you... and my Mino's and Griff's in the Desert as well... and yes TROLLS) that completely FUBAR a solo Warrior's chance, it doesn't matter.
Just go out, and beat on something. Take out your frustration in every zone you can find. Who knows, you mind find a farming spot that isn't used much, or hasn't been used in a while, and it might turn profitable for you!
~ Nihilist