So, I'm going to go ahead and say that "The Ledge" has to have an increased drop rate on various orbs. Just did some grinding there for about an hour and got the following:

8x Armourers Scraps
9x Orbs of Alteration
3x Chaos Orbs
7x Blacksmiths Whetstones
6x Orbs of Augmentation
4x Orbs of Transmutation
3x Chromatic Orbs
1x Orb of Alchemy
2x Glassblowers Baubles
1x Orb of Regret
1x Orb of Chance

Also got probably a dozen or so rares and six levels from that zone. I'm about capped as far as XP goes in that zone, but I think I may just continue grinding there for orbs.

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