Another thought I just had is that there could be different types/tiers of different crafting things. Like with blacksmithing it can be split up between armor making, weapon making, ferrier (makes horseshoes, metal rings for bridles), & furnishing (which can be various things like metal furniture, traps, cages, flatware, and even hairpins -- I've seen blacksmithed hairpins made of iron before).
Leatherworking can be split as well to make upholstery, clothing, armor, saddles, etc.
Pottery can be split so there are building materials and furnishings.
Anyone have more ideas on this? I just got brain freeze.
