As far as I'm aware, this is the best source of plat for characters level 20 to 35 in the entire game. A level 20 character can make about 100 plat per hour - maybe more.
Just be careful - not only is the terrain around the rocks dangerous (they're all on "Ogre island"), but these guys are really hard to see against the rock - great camoflage! I was killing these with my very poorly geared 25 iksar necro, and was making at *least* 100 plat an hour.
Also, because of the terrain, it's easy to across more than one at a time. This, combined with their large aggro range, means you could have as many as 4 on you at once if you're not careful. For a soloing character low enough to exp off these things, that could be a lethal mistake...
Until you're high enough to kill Hill giants, this will likely be your main source of income - but speak up if you know of a better spot.
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If you can't do something well, learn to enjoy doing it poorly.
with my lvl 20 iksar sk before I did any real twinking I was able to solo these with no down time with a Takish-Hiz Sandworker Club. That club was my best item at the time. 45dmg life tap proc on a lvl 20 owns. I could tank 2 adds and have no problem killing all 3. I was able to easily solo them with my ranger bl and mage to.
They are on the islands were the translocaters send you form OT and BB. Its ben to long to say how to get to them from were you get ported to. if you have sence dead or track you can find em easy enuf.
I started to kill the mobs with my lvl 22 SHM.. Now I am 26 and they are still blue to me..5 levels solo on the same mob. And they are generous.. In 4-5 hrs you can level and get about 200pp as long as you dont drink the rum ( around 4pp worth)..