The Sealed Crate
referred to by Deebop contains these items:
I remember when at level 15 I teleported to Moonglade and got stuck there because I didn't have the coppers required to fly home, and didn't realize that there was a Druid specific flight point - I fished for hours because a handful of silver from the items in the Mithril Bound Trunk
and the Raw Greater Sagefish
seemed like a fortune, and it was the richest I'd ever been.
But just to rein in expectations somewhat, I doubt very much however that on any server you can easily make "thousands of gold" from fishing around Darkmoon Island - although to a level 15 player a few hundred might seem like that much. [EDIT -> by easily, I mean when most players are playing - folks who do so at times when no one is playing seem to do quite well.]
On my server at least there is a ton of people scurrying around looking for the pools, and unless you are right there someone is very likely to fish it before you get to it, unless you do it in the way off hours of the morning. I suspect that a lower level character could probably do just as well gathering lowlevel mats and AH'ing them [edit-> unless they can manage to be on when there is little to no competition for the pools.]
My opinion, for what it's worth.