This suggestion is an attempt to spice up crafting without completely overhauling and redoing the entire crafting system. Its a subtle change that I think adds a lot of depth and allows crafters to work and specialize themselves.
The suggestion is the implementation of tiered recipes. The first of these tiers is what you receive from a trainer or a scroll (for the rest of this suggestion I'll use the Tin Longsword as an example). Now this Tin Longsword recipe is cool and such, but what if it got BETTER as you crafted more of them? What if there was an experience meter on the recipe itself in your book that filled as you made more!
So lets say you crafted so many of them and filled that bar, then bam! you'll get a notification and a new recipe in your book called Well-Made Tin Longsword! (Your old recipe would stay in there as well) This new recipe has a little higher stats, and a slightly higher mat cost (Maybe a Moonstone, since most armor/weaponsmiths have tons of them lying around from mining). If you craft so many of those you'll get the next tier, so on and so forth.
If you kept working hard, eventually you could make a Mastercraft Tin Longsword, which would be Epic Quality, have high level mats for that level and result in a really nice weapon for that level of player.
What this does is gives crafters an incentive to continue gathering/working past max skill level, as it stands outside of your dailies and spamming trade chat looking for work for money. You really have zero reason to gather mats for yourself, and your profession goes basically un-needed. This system would mean you could go out and work and advance your crafting to enhance your abilities and unlock new recipes. Maybe you want to specialize and get all the axe recipes, someone else gets all the sword ones, and some other guy the daggers, eventually you're all specialized and crafting is fun again!
At lower levels I'd assume it'd take less to level up a recipe so to speak, however higher level recipes (and by extension, epic recipes) would require a lot more to unlock the advanced versions. So even the best crafters won't be running around with T7 recipes for more than a recipe or two. However some players may wish to specialize in lower level epics, whereas some players would want higher level recipes for them, the joys of crafting and general economics roll in!
Tier List Breakdown:
T1 <Name> (Trainer Recipes and Scroll Recipes)
T2 Well-Made <Name>
T3 Superior <Name>
T4 Ornate <Name>
T5 Pristine <Name>
T6 Exceptional <Name>
T7 Masterwork <Name>
This system was designed with Armorsmithing, Weaponsmithing, Artificer, and Outfitting in mind, I'm sure this could somehow be applied to Apothecary and Runecrafting as well.
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