Bag of platinum yielded me around 15k when I last claimed one.
That's about 3 long afternoons killing bears/wolves/snakes in goru'kar mesa as a level 60+ btw. You can do the camp in the 40s (depending on class/merc) it will just take more time per kill... but it will yield xp too.
Less time as a 70+ in Blackfeather if you loot all the $ drops. It scales up from there of course. (just pointing out that there are reasonably fast $ acquisition methods in the game at a lower level now).
edit: to reflect Touch's input
Edited, May 2nd 2012 5:01pm by snailish