The thing I don't get about the Dark sets is that they're too expensive... The game actually doesn't allow you to buy them and craft them in time without the player resorting to shady tactics. I played through Flotsam and wasn't able to buy off all the recipes (didn't had enough money for the silver sword), but I didn't really lurk all that much for orens when I was in Flotsam, even though I did most of the quests.
Well I thought, okay, I'll grab any badly and not-badly placed oren when I'm in act 2 and I'll surely be able to buy the second set... As it appears I was wrong, I've done every available quest (including the newly added 'collect a gazzilion of feathers' quest) and all I was able to do is to buy most of the recipes (haven't had enough money for the silver sword yet again lol) and craft the pants, gloves and boots from the set, which were obviously the most cheap staff to craft... There was no other way to get money anymore, so I was forced to go arm wrestling 10 times with Adam Pangratt to get the money I lacked.
You just won't have the resources to craft those sets unless you succumb to some sort of an exploit. Now I'm in Act 3 and I have 1.5k orens, how the hell am I supposed to buy the final Dark Set? It's impossible ):