I've been trying to grind some extensive pickpocket (all mobs in shadowy/r2 and a lot more after that) for the off chance of getting some water and while it can generate a surprising amount of gold (that I don't really need) it's not a very efficient water grinder
What did surprise me is the amount of monsters with pockets, for example both shambling mound and stone statue have pockets! but stone golem does not.
Time to grind a bit of forest I think.
Current merchant found a whopping 2 shops, one scroll, one spellbook.
On a side note, I got a huge chunk of knowledge crystals in early midgame from digging, a shame merchants don't come with concentration but then again that would make it a usefull class