I do a daily thieving run on select merchants. It's quite achievable even on Honour mode without save-scumming. In particular, I prefer to sell stacks of gems which can be split and easily stolen back - economizing the effort.
Anyway, the loot from thieving far exceeds the usual amount of loot you pick up on a regular day between short rests. Of course you still want to check obvious enemies and chests for special loot. But you don't need to pick up everything.
